LON - ONT

£278 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 23/1. 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

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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 47,107,125 times on KAYAK, and here's why:

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Cheap flight deals from London to Ontario (LON-ONT)

 
These are the cheapest deals for flights from London to Ontario currently on KAYAK along with options from the most popular airlines KAYAK users selected for this route. 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 round-trip 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
20:00 - 22:13LHR-ONT
34h 13m2 stops
06:05 - 09:40ONT-LHR
19h 35m1 stop
Wed, 4 Dec - Tue, 10 Dec
06:20 - 16:45LHR-ONT
18h 25m2 stops
06:00 - 07:05ONT-LHR
17h 05m2 stops
£447Delta
Find Deal
Wed, 4 Dec - Tue, 10 Dec
12:30 - 18:37LGW-ONT
38h 07m2 stops
06:00 - 18:50ONT-LGW
28h 50m2 stops
£473Finnair
Find Deal
Mon, 27 Jan - Mon, 3 Feb
13:15 - 22:32LHR-ONT
17h 17m1 stop
13:00 - 10:35ONT-LHR
13h 35m1 stop
£489Virgin Atlantic
Find Deal
Mon, 27 Jan - Mon, 3 Feb
10:35 - 18:00LHR-ONT
15h 25m1 stop
13:00 - 09:40ONT-LHR
12h 40m1 stop
£500United Airlines
Find Deal
Mon, 28 Apr - Mon, 5 May
13:45 - 23:58LHR-ONT
18h 13m1 stop
06:10 - 11:15ONT-LHR
21h 05m2 stops
£511United Airlines
Find Deal
Wed, 11 Dec - Tue, 24 Dec
10:45 - 23:53LHR-ONT
21h 08m1 stop
13:21 - 10:00ONT-LHR
12h 39m1 stop
£516Virgin Atlantic
Find Deal
Wed, 19 Feb - Wed, 26 Feb
13:50 - 22:00LHR-ONT
16h 10m1 stop
10:51 - 08:15ONT-LHR
13h 24m1 stop
£519Finnair
Find Deal
Thu, 20 Feb - Thu, 27 Feb
08:20 - 18:37LHR-ONT
18h 17m1 stop
06:00 - 17:15ONT-LHR
27h 15m2 stops
£555British Airways
Find Deal
Mon, 27 Jan - Mon, 3 Feb
08:20 - 22:13LHR-ONT
21h 53m1 stop
07:16 - 06:20ONT-LHR
15h 04m1 stop
£603British Airways
Find Deal
Tue, 10 Dec - Tue, 17 Dec

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 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 £463 on average. On the other hand, the most expensive months are August and December, where the average cost of tickets is £882 and £662 respectively.

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

To calculate daily average prices, KAYAK takes all prices for each day before departure over the last year for 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 month.
To get a below average price on the flight from London to Ontario, you should book around 5 days before departure. For the absolute cheapest price, our data suggests you should book 95 days before departure.

Good to know - Cheap tickets from London to Ontario

Low season

January

High season

September

Cheapest flight

£278
Best time to beat the crowds (17% 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 £352 for a one-way ticket and £561 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?

    Star Alliance, oneworld, and SkyTeam are the airline alliances operating flights between London and Ontario, with SkyTeam 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 £571 and an overall rating of 7.7, Finnair is the most popular choice. Virgin Atlantic is also a great choice for the route, with an average price of £525 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.
7.7
FinnairOverall score based on 1300 reviews
7.7Boarding
8.2Crew
7.5Comfort
6.7Food
6.9Entertainment
Airline reviews

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

8.0 ExcellentAnonymous, Nov 2024HEL - ICN
Read more Finnair reviews

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

Our connecting flight was cancelled and it took us 15 hours to reach our destination.

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

Quick flight. But cabin crew were very noisy and talking too much, especially when we were seated at the back of the plane trying to sleep through the night .

My ticket was for Premium Economy and all the seats were taken, I was placed in Economy class and I’m looking for a refund.

Unfortunately delayed 2 hrs due to faulty tyre.. which had to be changed, but better safe than sorry.

Staff was generally seeming stressed out and was a bit rude and slow. Plane left late. Pilot was very well-spoken.

Cabin was pitch black, even during meal service. The reading lights for seat 2E/F did not work, and seat 2E did not recline.

This was a 5 hour flight with no entertainment and with a snack being provided (pretzels and fruit bar), which are both high in carbs and sugar. Nuts would have been a better choice.

The seat seemed roomy, the service was good, everything was fine.

Was realllly smooth. It was delayed but we were well informed.

Connection coordination with Star Alliance partner could be better. Lots of check in setup was not interlinked between operators.

The senior flight attendants were amazing. Totally different vibe from other carriers. Easy 10 hour flight in Business Class. Great food. Good humor as well.

Good plane, crew, and flight. Boarding was a bit chaotic. Bathrooms were unacceptable. United DESPERATELY needs a new terminal at IAD.

I was lucky to sit in a seat with legroom in economy . The airplane felt like it was 100 years old, seats were very basic, barely reclined. Food was alright , staff was ok but not the friendliest. But all in all ok trip, perfectly on time

Haven’t used United in a while. Was surprised with the free blanket and earphones. Service was great. Huge plane. 9/.row.

Liked - efficiency of boarding with 2 jetways. Checkin was with kiosks with helpful and plentiful workers to help with the process. Munich airport security was very automated, efficient and effective. Free wine and beer! Cons - food was only okay in economy class. Plane bathrooms could have been cleaner.

Disappointing. Too many let-downs, in delays and communication, by both Lufthansa and Discover to put in an email. I am resigned to the fact that this is what I should expect from all airlines. Unfortunately.

Crew were professionals. However, the plane seats are too small -essentially there is no space to move around which for so many hours is almost inhuman but certainly unacceptable. Same with the bad quality of food and the fact that you need to purchase Wi-Fi

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.

It was excellent. I upgraded from premium economy to business and it was totally worth it. We were on a 747 and I sat upstairs and enjoyed the privacy. The crew was incredible especially the woman who had been working with you all for 30 years.she was absolutely spectacular as was her cabin. The food was delicious. I would just serve bread with the meal. Don’t take it away!

The connection to LYON was very tight. The flight was nearly finished boarding when we got to the gate

I did not like that they failed to put my luggage on my connecting flight to Athens. I was promised it would be located and delivered within 2 days but later told there was no information on its location. This caused me to have unplanned for expenses because I then had to purchase new clothing to wear on my vacation. I did not receive my luggage until my return flight home. I will not be traveling with them again.

Flight was fine, food better than anticipated and flight attendants were helpful and friendly.

Our headphone plug is broken, we can not enjoy our entertainment, especially traveling with 5 year old who like to watch movie

Pleasant, attentive and efficient flight attendants. Boarding process and seat selection easy. No internet on transatlantic flight. Extremely uncomfortable, rigid seat.

The seats of the Boeing 787-10 Dreamliner were ridiculously uncomfortable. I was on 10 flights during this vacation and this plane was super uncomfortable both times I was on one whereas all of the others were perfectly fine. Additionally, these planes do not have any air vents that passengers can control, the climate is entirely controlled by the crew which made for an extremely uncomfortable temperature for the duration. The flight attendants tried to make everyone happy with the temperature but several people you could tell were excessively warm and just wanted a bit of airflow.

Don't fly thru London Awful and huge U need 4 hrs to transfer cuz u have to tale buses to and fro from airplanes Bad business

Staff with low service level, forgetful. Temperature at 15 C and after asking twice to raise the temperature the crew did nothing.

They had about 20-25 people overbooked. Including me. Why is this?? I was put on a flight to NC an hour later with a 4 hour layover. I was supposed to be home at 1045am instead i was home at 7:30pm. An extra day to pay for dog care.

Boarding is not controlled as groups called was not enforced

The plane was clean. The crew were lovely. Food was good - but seat 1D is a poor location. - the crews cupboard is right near your feet and they visited them frequently swishing the curtain from the galley onto my feet everytime also creating a swish of cold air each time & then slamming the door.

Horrible food and uncomfortable plane. One toilet was out of service.

Book cheap flights from London to Ontario

Cheapest flights to Ontario from London found in 2024 and 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.
23/1Thu
1 stop
31h 32mLGW-ONT
£278
23/1Thu
2 stops
27h 40mLGW-ONT
£289
26/1Sun
1 stop
15h 59mLGW-ONT
£306
29/11Fri
2 stopsUnited Airlines
22h 14mLHR-ONT
£531
26/11Tue
2 stopsUnited Airlines
19h 14mLHR-ONT
£532
8/12Sun
1 stopFinnair
16h 50mLHR-ONT
£585
2/4Wed
1 stopFinnair
14h 52mLHR-ONT
£1,147
21/1Tue
1 stopBritish Airways
16h 26mLHR-ONT
£1,172
19/2Wed
1 stopBritish Airways
18h 15mLHR-ONT
£1,175
27/2Thu
1 stopVirgin Atlantic
21h 08mLHR-ONT
£1,193

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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.
25/11Mon
multi-stopUnited Airlines
15h 38mLHR-ONT
2/12Mon
multi-stopUnited Airlines
14h 05mONT-LHR
£762
22/11Fri
multi-stopKLM
18h 05mLHR-ONT
25/11Mon
multi-stopKLM
14h 42mONT-LHR
£787
26/11Tue
multi-stopBritish Airways
15h 32mLHR-ONT
3/12Tue
multi-stopBritish Airways
12h 37mONT-LHR
£790
22/11Fri
multi-stopUnited Airlines
15h 38mLHR-ONT
2/12Mon
multi-stopUnited Airlines
14h 05mONT-LHR
£792
22/11Fri
multi-stop
19h 13mLHR-ONT
25/11Mon
multi-stop
15h 35mONT-LHR
£796
22/11Fri
multi-stopIberia
16h 24mLHR-ONT
25/11Mon
multi-stopIberia
12h 37mONT-LHR
£809
22/11Fri
multi-stopBritish Airways
16h 24mLHR-ONT
24/11Sun
multi-stopBritish Airways
28h 06mONT-LHR
£820
23/11Sat
multi-stop
18h 43mLGW-ONT
30/11Sat
multi-stop
19h 45mONT-LGW
£853
22/11Fri
multi-stopAir Canada
19h 13mLHR-ONT
24/11Sun
multi-stopAir Canada
16h 30mONT-LHR
£857
22/11Fri
multi-stopIberia
16h 24mLHR-ONT
24/11Sun
multi-stopIberia
32h 27mONT-LHR
£858

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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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