LON - ONT

£273 Find Cheap Flights from London to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from London to Ontario departing on 6/2. 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
0 bags

Search hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Ontario.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Ontario.
In the last 7 days, travellers have searched 41,299,237 times on KAYAK, and here's why:

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Cheap Flight Deals from London to Ontario (LON-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from London to Ontario 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 London to Ontario

Recommended return deals departing in the coming months from the most popular airlines that fly from London to Ontario.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
07:40 - 20:51LHR-ONT
21h 11m2 stops
06:00 - 11:05ONT-LHR
21h 05m1 stop
£408United Airlines
Find Deal
Mon, 27 Jan - Mon, 10 Feb
07:40 - 20:51LHR-ONT
21h 11m2 stops
06:15 - 12:00ONT-LHR
21h 45m1 stop
£409United Airlines
Find Deal
Mon, 27 Jan - Mon, 10 Feb
13:50 - 22:45LHR-ONT
16h 55m1 stop
14:54 - 12:05ONT-LHR
13h 11m1 stop
£422Finnair
Find Deal
Wed, 12 Feb - Tue, 18 Feb
20:25 - 16:28LHR-ONT
28h 03m2 stops
13:21 - 11:10ONT-LHR
37h 49m2 stops
£426Virgin Atlantic
Find Deal
Mon, 10 Feb - Wed, 19 Feb
10:45 - 23:53LHR-ONT
21h 08m1 stop
13:00 - 07:55ONT-LHR
34h 55m1 stop
£427Virgin Atlantic
Find Deal
Tue, 21 Jan - Sun, 26 Jan
10:40 - 18:37LHR-ONT
15h 57m1 stop
16:25 - 13:20ONT-LHR
12h 55m1 stop
£443British Airways
Find Deal
Tue, 11 Feb - Tue, 25 Feb
13:45 - 09:51LHR-ONT
28h 06m1 stop
06:15 - 07:25ONT-LHR
17h 10m1 stop
£457Lufthansa
Find Deal
Mon, 20 Jan - Mon, 3 Feb
14:30 - 22:00LHR-ONT
14h 30m1 stop
14:54 - 12:30ONT-LHR
13h 36m1 stop
£471British Airways
Find Deal
Tue, 11 Mar - Tue, 1 Apr
13:50 - 22:45LHR-ONT
16h 55m1 stop
15:04 - 12:05ONT-LHR
13h 01m1 stop
£480Finnair
Find Deal
Sat, 8 Feb - Mon, 10 Feb
13:45 - 20:40LHR-ONT
14h 55m1 stop
10:38 - 12:00ONT-LHR
18h 22m1 stop
£507Lufthansa
Find Deal
Wed, 5 Mar - Fri, 14 Mar

Flights from London to Ontario - Travel Insights & Trends

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

What is the cheapest month to fly from London to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London to Ontario, 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 London to Ontario is April, where tickets cost £479 (return) on average. On the other hand, the most expensive months are August and December, where the average cost of round-trip tickets is £906 and £735 respectively.

How far in advance should I book a flight from London to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London to Ontario, 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 London to Ontario, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 22 weeks before departure.

Good to know - Cheap tickets from London to Ontario

Low season

January

High season

September

Cheapest flight

£273
Best time to beat the crowds (15% less expensive on average)
Most popular time to fly and prices are also 17% lower on average.
Flight from London Gatwick Airport to Ontario

When to book flights from London to Ontario

Are your dates flexible? Find out the best times to travel from London to Ontario 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.

FAQs for booking flights from London to Ontario

  • What is the cheapest flight from London to Ontario?

    In the last 3 days, the lowest price for a flight from London to Ontario was £336 for a one-way ticket and £502 for a return.

  • Which airports will I be using when flying from London to Ontario?

    London is served by 5 major airports and there is only 1 main airport in Ontario. You will leave London from one of these airports: London City, London Gatwick, London Heathrow, London Luton, or London Stansted. You will be arriving at Ontario.

  • Which aircraft models fly most regularly from London to Ontario?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from London to Ontario?

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

  • Which is the best airline for flights from London to Ontario, Finnair or Virgin Atlantic?

    The two airlines most popular with KAYAK users for flights from London to Ontario are Finnair and Virgin Atlantic. With an average price for the route of £556 and an overall rating of 7.6, Finnair is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of £556 and an overall rating of 7.5.

  • How does KAYAK find such low prices on flights from London to Ontario?

    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 London to Ontario.

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

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

  • What is the Hacker Fare option on flights from London to Ontario?

    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 Ontario with an airline and back to London with another airline.

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

    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 Ontario from London up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top 5 airlines serving from London to Ontario

 
See real verified KAYAK customer reviews for airlines flying from London to Ontario. 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 London to Ontario? 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.
7.6
FinnairOverall score based on 1284 reviews
6.7Food
8.1Crew
6.9Entertainment
7.7Boarding
7.5Comfort
Airline reviews

The cabin crew really looked like they wanted to be somewhere else. They weren't really interested in providing an attentive service to full fare paying passengers at all. However the Captiain's in flight announcements were relaxed and very entertaining.

8.0 ExcellentRowland, Dec 2024HKG - SYD
Read more Finnair reviews

The cabin crew really looked like they wanted to be somewhere else. They weren't really interested in providing an attentive service to full fare paying passengers at all. However the Captiain's in flight announcements were relaxed and very entertaining.

Crew were professional and responsive. Food was mediocre and breakfast could do with revampinmg

Food was very ordinary for premium economy, very small portions.

i dont know WHY they call it business class. the seats are NOT significantly wider than economy seats, they just do not let the middle seats be beepked to give the illusion of more space between passengers. the seats do NOT recline any more than economy seats either. the only real difference is the full meal served to business (vs none for economy). I would rather have a wider, lie flat ACTUAL business class seat with no food for a 3 hr flight. this was pretty disappointing to say the least.

There wore nice leather like sits, in my opinion seats lay out bit tight . Crew was great they did averything possible to make averywone comfortable as possible, food was, think worst I ever head on flight, head chicken and yellow rice. Ice cream was a nic treat.

Our previous flight was delayed but they waited for us to board.

Flight was delayed, short time connection to next flight but we make it, service was good, worth to fly just to try thair on board blueberry juce. Eccelent communication with airline.

My American Airlines flight was deleted and you guys never let me know

The entertainment system did not work. And we waited 45 minutes in our seats after we landed before we got to the gate

It was a pleasure definitely going with Iberia on my future travels

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.

My only complaint is that the pocket in front of me was ripped and my things, like iPad and airline magazines, kept slipping to the floor.

Flight delayed yet again. Crew apathetic and unhelpful re affect on connecting flight.

I think Virgin is one of the best flying experiences, especially from/to the UK. The staff are so helpful and fun, the food is good, seats comfortable, goof entertainment and great value. Check in and boarding is pretty pain free. I also find that the other passengers are generally so kind and considerate than when I've flown other airlines.

Cabin crew on our flight showed lack of any customer service gruff and acting annoyed if you asked anything and I mean anything Example a man on the seat over dropped his beer on my husbands blanket We asked if we could switch out blankets cabin crew Said. No we don’t have any extras OK well can you take the wet one Cabin crew looked disgusted and annoyed Took it no OK or yes just a growl

The ANA crew and their members were all extremely nice and caring. Shout out to the crews for working on Christmas and New Years. Y'all the real MVP

Awful. Worst airline I have ever been on. Crew were among the rudest people I have ever dealt with. United staff members were rude and disrespectful. My flight was delayed, causing me to miss a connecting flight. I understand things happen, but when staff start lying about what actually happened, that is when I have an issue. Just be honest, really it isn’t that hard. I’m being very honest with this review and I don’t find this difficult what so ever. In fact, because of United Airlines, my Christmas holiday was off to a really rocky start. As someone who has traveled across the world, it has only been United that I have had a truly awful experience.

Boarding always seems a bit chaotic. Seat spacing could leave more for leg room.

Good flight. On time. Boarding and seating was easy. Crew were really friendly, yet professional. Bathroom (by cockpit) was small but serviceable. Some the seats were showing some notable wear & tear, but were comfy. Very happy UA customer. TY! 🤛🏽💗

We arrived early and finally made it to our gate almost an hour after.

We were delayed 3x and because I didn’t purchase my tickets directly from United Airlines I was told I Have to take care of it myself so I called Underpricer and they helped me but before I changed my flights I took the risk of sticking by what my tickets were and was lucky to have gotten on the original all flight with only 15 mins before take off. not sure if I will do this again

The flight was delayed so the people from a late connecting flight was able to still make the connection.

Everything good until we waited for jet bridge at SFO. Then pilot gets on speaker & said it won’t reach plane- too short, need to go to different gate. Then 5 min later, adjusted plane/jetbridge & all ok?!?

Was a pain having to leave the plane and reboard but glad the plane was fixed

We had to wait almost an hour for the wheelchair porter to be ready to pick up my mother. And when she arrived in Newark airport the porter was not there and she started walking with her cane and her poor mobility. When the Newark porter found her they didn't want to transfer her bags to the wheelchair for her.

I got an email in the morning of the flight 1/7, from Kayak, that I was rebooked from UA 906 to LH 430. Nobody at Lufthansa ot United knew about this. I went to both counters. at the airport. Also, Cheap Flights, who I booked the ticket through, did not know. I ended up staying on the United flight. But this was very disturbing, since I got a very late notice that I was rebooked to an earlier flight, I hurried to the airport to find out after a lot of inquiring that this was a mistake. Not a good Kayak experience.

Eet late informed about delay of more rhan four houts

Terrible experience. Should be a short simple flight from San Francisco to Palm Springs. Disgusting insult that United Air doesn’t have a cabin crew ready to receive a plane that’s already an hour plus late in departure. Lots of misinformation along the way from cockpit and crew. Definitely unimpressed with both union and management.

Not what I expected for the last leg of a $5100 business class experience. Boarding was a nightmare. The flight was delayed and I had to keep checking my email to ensure I was at the right gate since the airline or the terminal had no clue until 15 mins prior to boarding. Food was gross, limited drink options.

Flights scheduled with impossible connections - Lufthansa apparently believes it takes 7mins to change terminals, go through passport control, re-clear security and walk 1.8kms…..and everything will work perfectly (which it never does at Frankfurt). No staff on hand to assist with transfers on delayed flights. No transfer guidance provided by app. No compensation offered for 6hr delay to connecting flight.

This was the best carrier, comfort, service, good food, on time experience on a long haul flight. New, clean, quiet, smooth aircraft!!!

Crew were friendly and very helpful Plane was clean and the legroom is standard. Overall a good flight, no complaints.

Great crew dealing with the most unprepared family with a million kids and zero sense.

The plane was clean and the staff courteous and professional. The seat bottom was uncomfortable but only after many hours. It had a pressure point that left me a small bruise on my right leg (very surprising). The pasta was terrible (hard on the edges sticking out and soggy on the bottom edges) but I guess that's how it comes out in a microwave (?). The entertainment was glitching and shutting off every 20 minutes or so but, in the end, we made it home safely with very little turbulence and that's what really matters.

The food was straight up bad not gonna lie, seats are uncomfortable so I had to re-adjust my self most of the time, delayed our arrival time by alot.

Reliable, great value, but not outstanding in any aspect. This is similar to the experience you get in most international carriers like Etihad or Delta.

Flight got diverted because of an emergency and the crew were fantastic and probably saved that passenger’s life. While in emergency landing some measures could have been taken to prevent additional delays. In general not great experience with BA. I used to fly BA years ago all the time, very disappointed by the whole experience, seats were tight, bathrooms tight.

Business class area too small and chair and equipment not comfortable .

Lost my luggage in London Was double charged for luggage

Boarding could have been better organized. The one member of staff disappeared for a while so boarding by group relied on honesty.

I never made this flight but the staff helped to get me rebooked (see previous review)

The seat was very uncomfortable. It helped to use the foot rest. Could not sleep because of the seat.

The seats are incredibly uncomfortable. My luggage didn't make it on the flight from London to Nashville.

The plane itself is old and way overcrowded. The crew do a great job of trying to mitigate. It is just uncomfortable for over 8 hours, bearable, but barely. Boarding, and the baggage game, is ludicrous. Why charge extra to check bags when there is not enough room for everyone to "carry-on" and checking is needed? I do not think these issues would be different with other airlines, I believe it is the attitude that squeezes every penny out of each traveler.

Expected a lot better service paying for a business class seat. Seemed to be short on staff and did not get the service I expected.

Book cheap flights from London to Ontario

Cheapest flights to Ontario from London found in 2025

Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from London to Ontario found on KAYAK in the last 72 hours.
6/2Thu
1 stop
13h 55mLGW-ONT
£273
6/2Thu
2 stops
27h 40mLGW-ONT
£314
12/2Wed
1 stopFinnair
17h 12mLHR-ONT
£512
30/4Wed
1 stopFinnair
18h 44mLHR-ONT
£514
6/2Thu
2 stopsVirgin Atlantic
18h 08mLHR-ONT
£564
6/2Thu
1 stopVirgin Atlantic
17h 52mLHR-ONT
£575
21/1Tue
1 stopBritish Airways
15h 57mLHR-ONT
£915
5/3Wed
2 stopsUnited Airlines
21h 12mLHR-ONT
£1,189
21/4Mon
2 stopsUnited Airlines
20h 42mLHR-ONT
£1,198
6/3Thu
1 stopBritish Airways
16h 24mLHR-ONT
£1,217

Search by stops

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Last minute flights from London to Ontario

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from London to Ontario that are departing in the next 10 days.
14/1Tue
multi-stopKLM
13h 43mLHR-ONT
23/1Thu
multi-stopKLM
13h 35mONT-LHR
£776
14/1Tue
multi-stopKLM
18h 22mLHR-ONT
21/1Tue
multi-stopKLM
14h 40mONT-LHR
£776
14/1Tue
multi-stopBritish Airways
15h 57mLHR-ONT
21/1Tue
multi-stopBritish Airways
12h 55mONT-LHR
£784
14/1Tue
multi-stopUnited Airlines
15h 59mLHR-ONT
4/2Tue
multi-stopUnited Airlines
14h 53mONT-LHR
£785
13/1Mon
multi-stopKLM
16h 22mLHR-ONT
27/1Mon
multi-stopKLM
13h 35mONT-LHR
£798
13/1Mon
multi-stopBritish Airways
17h 12mLHR-ONT
19/1Sun
multi-stopBritish Airways
22h 21mONT-LHR
£810
14/1Tue
multi-stopLufthansa
15h 59mLHR-ONT
19/2Wed
multi-stopLufthansa
17h 24mONT-LHR
£849
12/1Sun
multi-stopUnited Airlines
18h 26mLHR-ONT
16/1Thu
multi-stopUnited Airlines
14h 53mONT-LHR
£1,250
11/1Sat
multi-stopLufthansa
17h 12mLHR-ONT
18/1Sat
multi-stopLufthansa
17h 30mONT-LHR
£1,571
12/1Sun
multi-stopIberia
22h 56mLHR-ONT
16/1Thu
multi-stopIberia
17h 09mONT-LHR
£2,597

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Everything you need to know for your flight from London to Ontario

Information on your arrival and departure airports

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