DEN - LHR

£171 Find Cheap Flights from Denver to London Heathrow Airport

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Denver to Heathrow departing on 18/10. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult

KAYAK searches hundreds of travel sites at once for deals on flights to London Heathrow Airport

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to London, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Denver to London, as well as popular online travel agencies
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Cheap Flight Deals from Denver to Heathrow (DEN-LHR)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Denver to Heathrow that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.

Recent return flight deals from Denver to Heathrow

KAYAK's recommended return flight deals from the most popular airlines that fly from Denver to Heathrow.
Discover the best prices for you by selecting your travel dates on KAYAK.
Choose your dates
Icelandair Logo
16:40 - 11:55DEN-LHR
12h 15m1 stop
Icelandair Logo
12:15 - 19:05LHR-DEN
12h 50m1 stop
£424Icelandair
Find Deal
Fri, 17 Oct - Sat, 1 Nov
Icelandair Logo
16:40 - 11:55DEN-LHR
12h 15m1 stop
Icelandair Logo
13:05 - 18:55LHR-DEN
12h 50m1 stop
£439Icelandair
Find Deal
Wed, 1 Oct - Tue, 7 Oct
Lufthansa Logo
17:35 - 09:40DEN-LHR
9h 05mdirect
Lufthansa Logo
07:25 - 13:45LHR-DEN
13h 20m1 stop
£477Lufthansa
Find Deal
Fri, 19 Sep - Tue, 23 Sep
British Airways Logo
18:35 - 10:35DEN-LHR
9h 00mdirect
British Airways Logo
13:35 - 16:25LHR-DEN
9h 50mdirect
£487British Airways
Find Deal
Tue, 30 Sep - Fri, 17 Oct
Iberia Logo
18:35 - 10:35DEN-LHR
9h 00mdirect
Iberia Logo
13:35 - 16:25LHR-DEN
9h 50mdirect
£488Iberia
Find Deal
Sun, 17 Aug - Thu, 28 Aug
Lufthansa Logo
15:40 - 11:25DEN-LHR
12h 45m1 stop
Lufthansa Logo
09:30 - 18:18LHR-DEN
15h 48m1 stop
£488Lufthansa
Find Deal
Fri, 26 Sep - Tue, 30 Sep
British Airways Logo
12:20 - 06:50DEN-LHR
11h 30m1 stop
British Airways Logo
13:35 - 16:25LHR-DEN
9h 50mdirect
£490British Airways
Find Deal
Tue, 30 Sep - Fri, 17 Oct
United Airlines Logo
20:20 - 12:20DEN-LHR
9h 00mdirect
United Airlines Logo
07:25 - 13:45LHR-DEN
13h 20m1 stop
£496United Airlines
Find Deal
Mon, 1 Sep - Thu, 18 Sep
United Airlines Logo
20:20 - 12:20DEN-LHR
9h 00mdirect
United Airlines Logo
08:45 - 19:55LHR-DEN
17h 10m1 stop
£497United Airlines
Find Deal
Wed, 15 Oct - Tue, 28 Oct
Iberia Logo
18:35 - 10:35DEN-LHR
9h 00mdirect
Iberia Logo
13:35 - 16:25LHR-DEN
9h 50mdirect
£509Iberia
Find Deal
Fri, 12 Sep - Sat, 20 Sep

Expert advice for your flight from Denver to Heathrow

 
Snippets provided in this section are AI-generated based on a summarisation of KAYAK-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are specific to the author and reflect their authentic experience, which may vary significantly from the experience of others.
KAYAK teamed up with top travel experts to share the best tips for your journey.
Airlines
Finnair

Finnair's A350 offers memory foam seats and USB ports for enhanced comfort.


Finnair Premium Economy features plated meals on real china, enhancing dining experience.

Read more about Finnairby Gabriel Leigh
United Airlines

United Polaris offers lie-flat seats with aisle access, perfect for restful long-haul flights.


United Premium Plus provides extra legroom and recline, ideal for long-haul comfort.

Lufthansa

Lufthansa Premium Economy offers 50% more space and an extra checked bag.


Lufthansa offers 11 special meals, catering to various dietary needs on long-haul flights.

Read more about Lufthansaby Jessica Macdonald
Iberia

Iberia's Business class offers roomy seating with all-aisle access and comfortable bedding.


Iberia's Premium Economy features wider seats and adjustable headrests, ideal for long-haul comfort.

Read more about Iberiaby Marisa Garcia
British Airways

BA Premium Economy offers 18 cm extra legroom, enhancing comfort on long-haul flights.


BA's economy includes a free cabin bag, avoiding surprise fees unlike budget carriers.

Our travel experts
Gabriel Leigh

Gabriel Leigh

Expert on Finnair

Gabriel Leigh

Gabriel Leigh

Gabriel is a writer and video creator. As senior content producer for Flightradar24 and Monocle’s transport correspondent, he keeps a close eye on aviation in particular. He has also written travel articles for the likes of The New York Times. Born in New York but raised around the world, he now lives in Sweden. He’s been to 75 countries, flying 2.3 million miles on 113 airlines and through 234 airports in the process.

Read more
Stefanie Waldek

Stefanie Waldek

Expert on United Airlines

Stefanie Waldek

Stefanie Waldek

Stefanie Waldek is a freelance space, travel, and design writer based in Saratoga Springs, NY. Her words have appeared in Space.com, Travel + Leisure, Condé Nast Traveler, Architectural Digest, and House Beautiful, among other publications. An expert in aviation and expedition cruising, Stefanie is frequently up in the air or out at sea, likely en route to Antarctica or the Arctic.

Read more
Jessica Macdonald

Jessica Macdonald

Expert on Lufthansa

Jessica Macdonald

Jessica Macdonald

Currently based in Scotland after living in South Africa and the United States, Jessica has been writing travel and aviation content for more than 10 years. She regularly contributes to Travel + Leisure and TripSavvy, and has had work published by Condé Nast Traveller and The Independent. She has travelled to more than 50 countries across six continents.

Read more
Marisa Garcia

Marisa Garcia

Expert on Iberia

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialising in airline interiors and regulations. 10 years ago, she pivoted to journalism. She shares her insights in leading aviation, travel and business publications and on her site, FlightChic.

Read more
Duncan Madden

Duncan Madden

Expert on British Airways

Duncan Madden

Duncan Madden

Duncan is a freelance travel writer, copywriter and book author in constant search of travel stories and the perpetual sensation of being on holiday. He’s never happier than when on a dusty trail in search of empty waves or ducking under the piste tape in search of snowbound solitude. British born, living in Germany, but happiest heading for the horizon. His first book, Found in Translation, explores the etymologies and stories of country names around the world and is out now.

Read more

KAYAK's insights & trends for Denver to Heathrow flights

Get data-powered insights and trends into flights from Denver to Heathrow to help you find the cheapest flights, the best time to fly and much more.

What’s the cheapest day of the week to fly from Denver to London Heathrow Airport?

The average price of all round-trip flights from Denver to London Heathrow Airport clicked on KAYAK for each day over the last 12 months.
Your flight ticket price will generally be cheaper if you fly to London Heathrow Airport on a Thursday and more expensive on a Saturday. On your return trip to Denver, you should consider flying back on a Wednesday, and avoid Sundays for better deals.

What is the cheapest month to fly from Denver to London Heathrow Airport?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Denver to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.
The cheapest month for flights from Denver to London Heathrow Airport is October, where tickets cost £466 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £873 and £777 respectively.

Can I save money by flying with a stopover from Denver to London Heathrow Airport?

The average return price for all direct flights, flights with one stopover, and flights with two stopovers for the route found by users searching on KAYAK in the last 2 weeks.
Yes, flying with a stopover may cost you more time, but you can also save money on the route, with a 1 stop stopover the cheapest option at £1,296 on average.

How far in advance should I book a flight from Denver to London Heathrow Airport?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Denver to London Heathrow Airport, removes the top 0.1% to account for outliers, and then takes the average of all the values for each week.
To get a below average price on the flight from Denver to London Heathrow Airport, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 7 weeks before departure.

Good to know - Cheap tickets from Denver to London Heathrow Airport

Low season

January

High season

May

Cheapest flight

£171
Best time to beat the crowds (19% less expensive on average)
Most popular time to fly (14% more expensive on average)
Flight from Denver to London Heathrow Airport

When to book flights from Denver to Heathrow

Are your dates flexible? Find out the best times to travel from Denver to Heathrow based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

Flights from Denver to Heathrow: the best tips from KAYAK users' own experiences

Insights shared by verified travellers who flew the route from Denver to Heathrow 
TressaFlew with LufthansaDEN-LHRDec 2024
Make your layover longer because you will need it for all the walking at Heathrow
Verified travelerFlew with IberiaDEN-LHRSept 2024
Coming from Denver with London as a layover you will have to go through security again

FAQs for booking Denver to London Heathrow Airport flights

  • What is the cheapest flight from Denver to London Heathrow Airport?

    In the last 3 days, the lowest price for a flight from Denver to London Heathrow Airport was £227 for a one-way ticket and £564 for a return.

  • Which airports will I be using when flying from Denver to London Heathrow Airport?

    On your way to London Heathrow Airport, you’ll fly out from Denver Intl. You’ll be landing at London Heathrow.

  • Which airlines offer Wi-Fi service onboard planes from Denver to London Heathrow Airport?

    Lufthansa, United Airlines, Air France, and Iberia offer inflight Wi-Fi service on the Denver to London Heathrow Airport flight route.

  • Which aircraft models fly most regularly from Denver to London Heathrow Airport?

    The Airbus A350-1000 is the aircraft model that flies most regularly on the Denver to London Heathrow Airport flight route.

  • Which airline alliances offer flights from Denver to London Heathrow Airport?

    oneworld, and Star Alliance are the airline alliances operating flights between Denver and London Heathrow Airport, with Star Alliance being the most commonly used for this route.

  • On which days can I fly direct from Denver to London Heathrow Airport?

    There are direct flights from Denver to London Heathrow Airport on a daily basis.

  • Which is the best airline for flights from Denver to London, United Airlines or Iberia?

    The two airlines most popular with KAYAK users for flights from Denver to London are United Airlines and Iberia. With an average price for the route of £510 and an overall rating of 7.4, United Airlines is the most popular choice. Iberia is also a great choice for the route, with an average price of £513 and an overall rating of 7.0.

  • How does KAYAK find such low prices on flights from Denver to London Heathrow Airport?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Denver to London Heathrow Airport.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Denver to London Heathrow Airport?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to London Heathrow Airport from Denver is likely to change within 7 days, so travellers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Denver to London Heathrow Airport?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly to London Heathrow Airport with an airline and back to Denver with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Denver to London Heathrow Airport?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to London Heathrow Airport from Denver up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

KAYAK’s top tips for finding a cheap flight from Denver to London Heathrow Airport

  • Looking for a cheap flight from London Heathrow Airport to Denver? 25% of our users found flights on this route for £319 or less one-way and £517 or less round-trip.

Prefer to fly direct from Denver to London Heathrow Airport?

Find which airlines fly direct from Denver Intl Airport to London Heathrow Airport, which days they fly and book direct flights.

Direct departures

Denver Intl to London Heathrow

Monday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Tuesday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Wednesday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Thursday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Friday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Saturday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Sunday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

See more direct flights

Direct returns

London Heathrow to Denver Intl

Monday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Tuesday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Wednesday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Thursday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Friday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Saturday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

Sunday

Aer Lingus, Air Canada, American Airlines, +8 more

Aer Lingus, Air Canada, +9 more

See more direct flights
See more direct flights

Top 5 airlines serving from Denver to Heathrow

 
See real verified KAYAK customer reviews for airlines flying from Denver to London. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Denver to Heathrow? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.4
United AirlinesOverall score based on 8685 reviews
7.1Entertainment
6.6Food
7.7Boarding
7.3Comfort
8.1Crew
Airline reviews

For economy, it was very good. Staff was great, they even let some of us change seats for more leg room... Put an empty seat between us which was fantastic for a 12hr flight. Onboard entertainment was excellent, I think over 200 choices of movies/tv/etc The bad was the barely/nonfunctional wifi that cost either $16.99 or 1700 miles (full flight). It was atrocious... Definitely the worst of the last 3 long haul major airlines I was on the last few months.

8.0 ExcellentMark, Apr 2025DEN - NRT
Read more United Airlines reviews

For economy, it was very good. Staff was great, they even let some of us change seats for more leg room... Put an empty seat between us which was fantastic for a 12hr flight. Onboard entertainment was excellent, I think over 200 choices of movies/tv/etc The bad was the barely/nonfunctional wifi that cost either $16.99 or 1700 miles (full flight). It was atrocious... Definitely the worst of the last 3 long haul major airlines I was on the last few months.

Electric plugs didn't work. Entertainment system wasn't working

The design of the light switch on the arm rest is ridiculous.

The gate attendant let me walk right by her with a bag too big for the overhead compartment

The flight was heavily booked so boarding was a lengthy process. The FA’s were rather abrupt during this process but became more gracious as the flight went on. Breakfast (puffed pastry and chewy sausage) was pretty horrible but there was fruit and yogurt which they didn’t mess up. Overall it was fine.

Fight was delayed an hour due to operational issues ,then further delayed due to ground control for a total of about 1.30 hours. Salad was completely frozen and flatware was so cold you could barely handle it. Crew was friendly and professional and the flight was smooth. The aircraft was clean and well-serviced.

Overall, it was a good experience. Boarding was good and there was plenty of overhead bin space for everyone’s carryons (even when we boarded toward the end). Only improvement would be to offer trash service more regularly.

David went above and beyond to make our flight the best that it could be

No food service almost missed because of first flight delays

Had a hard time finding my assigned seat. No attendants to assist.

I did not fly by vergin atlantic from bangalore to vasco da gama

Your flight delayed at Heathrow n I almost missed my mother funeral.you idiots. I had to waste 10 hours in different airports. Thank your stars I'm not suing you.

Miami airport needs more thorough signage. It was a long walk from my transport point to the check in desk,

Flight took off an hour late. Had to stay on the tarmac for half an hour after landing. Both annoying.

We had an unfortunate experience where we had to leave the aircraft after boarding, shortly before the scheduled takeoff time, and re-board. The reason given was that a passenger felt ill and had to cancel their plans and therefor their luggage had to be found and removed.

We’ve used VA before many times the experience is always been good they have lovely staff and the food is always delicious.

Everything about the flight was amazing from check in to boarding entertainment was okay food we didn’t try.

Seats were old and dirty, for a long haul flight you expect to be able to recline and for the av to work properly. Choice for vegans was fruit….

The Virgin Atlantic crew was very good. However, the equipment was OK, the seats were OK, but her bags did not arrive with me. Two bags showed up a day later and I’m still waiting for my third back.

The crew was very good. However, the equipment was a bit dated. Some of the electronics were not working. To top it, three bags didn’t arrive with me. Two of them were delivered a day later. I’m still waiting for the third bag, I was so looking forward to this virgin Atlantic flight, but, I am disappointed.

The seats were way too crowded. Just because I do not have the luxury of a suite, does not mean that I want to fly from Austin to London scrunched between two people and the seat in front of me in my face. Ridiculous. I should have flown with Turkish Airlines...

We travelled with Level, which is a subsidiary of Iberia. They mixed up all our seats, downgraded few from premium economy fo economy. The crew were not professional, they seem to be in a rush! Also some with an attitude

Paid for “extra room” selected seat. Wasn’t a benefit. Also was in aisle and was bumped almost every time attendants walked down aisle. Should have saved the assigned seat money and let them select.

Everything OK , except the plane left more than an hour late so I couldn’t participate in an excursion I had that morning in Brcelona

Flight from Madrid to Dakar had no onboard entertainment for a business class. Not even a single screen . That was disappointing. The WiFi only worked for the first 45 mins of the flight.

very good all round. staff, food, entertainment, punctuality all very good

The cabin crew were great very helpful and accommodating. We had a fellow passenger throw up next to us. The flight crew did an amazing job cleaning up and reseating us. We did question as to if he should have been let on the flight as his condition was likely self imposed.

online check-in was horrible and didn't work either way

Horrible. Paid for seats for my family. Iberia changed planes and never notified us that the seats we paid extra for did not even exist on the plane. We were randomly placed on the plane. Thankfully, we were seated together. Upon boarding, my youngest daughter was pulled from the line and they just arbitrarily changed her seat 7 rows back from the rest of the family. I had to wait at the gate while they tried to see us back together. One of the most uncomfortable small spaces on a plane I’ve ever experienced. When I called Iberia, they first told me that no mistake was made that the plane was never changed. Yet my receipt for my paid seats were for rows that did not even exist on this type of plane we were getting on. They said that they would reimburse my money and I would get an email, but I’ve never received any information or emails regarding a refund for the seats that I had paid extra for. Then when we arrived in Madrid, one of the pieces of luggage that we had checked in was damaged to the point that the handle that was stowed in to the luggage was broken off by the crew members handling the luggage. The crew on the plane was very nice, but as far as the rest of the experience, I would be very hesitant to ever use Iberia again.

The airline refused to board me because I showed up only 50 minutes prior to departure time, despite the fact that shortly before that, when I arrived at the airport still in time, they changed the terminal and I had to take a bus that took 20 minutes. Keep in mind that for some maintenance error I could not check in online like I usually do. Personnel at the airport was unable to let me in, customer care was beyond useless, the original airline operator (Iberia) was as useless as a toilet paper roll core in time of a wipe and all this uselessness made me waste my ticket, my reservations, my long time parking, food and most of all the joy of being with my family for the new year after working my bottom off even at Christmas. Am I happy? Come and ask me in person!

The row of seats were so cramped it was difficult to get in and out of your seat. I even upgraded. A long flight and sad accommodations 😵‍💫 the shorter flight was very comfortable and the seating was spacious

I bought a ticket and paid for for our luggage but I had to pay for my luggage again. I’m so disappointed! We had a 30 min delay and because of that we missed our connecting flight and were told that we would be on the next flight (9am flight ) but we were landed we were booked at 12pm flight. I had a little baby w me, it was very stressful. I begged to leave at 10 am at least. I was emailed that we get a voucher but they didn’t work when we were at a breakfast store. I’ve been always happy w Lufthansa but this time was awful.

Good service … bus transfer upon arrival from plane to terminal: atrocious!!!

helpful and friendly. The Lufthanza people I dealt with before my holiday were so unhelpful by comparison.

We had a 1 1/2 hour delay before we left Denver. When we arrive to Frankfort, they didn’t announce that people with connecting flights to exit the plane first. My next flight was already boarding when we we taxiing in to the gate. I waited another 10 minutes to get off the plane. I had to run to catch my next flight. I mean run! I made it with one minute to spare, but my luggage did not. My luggage came two hours later on a different flight.

My flight was late from US to Frankfurt so I missed my connecting flight flight and I had to wait for long to catch the next flight which was very tiring. Otherwise everyone was very nice.

It would have been nice if my luggage had made it onto my connecting flight as well. Now I have to wait for my luggage to be delivered and that might take a while, which certainly put a damper on the entire experience.

Crew was not happy. Very uncomfortable seats. When person leans back in front of you the screen is too close to me. Food was awful.

They lost my luggage and despite all follow ups through emails and phone calls they don’t give me an update

Everything went really well. Snacks could be better and there was no tea/coffee service after dinner. Crew was helpful and friendly.

I don’t understand why a reputable airline like BA would delegate their London flights to AA. Makes no sense to me, as most domestic carriers do such a poor job these days. Terminal 3 at LHR is a total dump

Cancelled flight minutes before boarding. Rescheduled flight was two days later

The flight attendants were EXTREMELY personable and appreciated the service, lights going off after dinner (probably the norm, but I haven’t flown evening overnight flights in a while). Thank you!

Business class seats were very dated on my plane. Very little storage, charging ports were not easily accessible, tv screen kept flopping away. Vegetarian food was disappointing: hardly any protein and severely under-seasoned. Crew was lovely.

The food was ok, but not great. They delayed boarding in Portland and did not enforce group boarding. But the crew was excellent, went above and beyond.

The food was pathetic. There wasn't much leg room and recline space for such a long flight. No tea/ coffee for a 2-3 hour connecting flight without purchasing! Really!?

Service was very good. Because I use a cane, I was allowed to use Priority Boarding. Biggest problem was extremely limited leg room in Economy class seats. For airplane food, it was alright.

Experience was good. Could have been better if we didn’t have to board an hour before the flight to ghana and miss relaxing time in the lounge. That process was very stressful

I was charged fees for check in bags at the airport by British Airways. It was supposed to be no charge but Kayak messed up my booking apparently and I had to pay for check in bags. I paid $175.

They took my carry on and checked it in. Staff in general at Heathrow are not friendly or helpful

Everything you need to know for your flight from Denver to Heathrow

Information on your arrival and departure airports

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