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LON - ONT

£387 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 23/9. 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
Sun 9/6
Sun 16/6

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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 43,156,178 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 round-trip 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.
Discover the best prices and deals for you by selecting your travel dates.
Choose your dates
09:25 - 17:48LHR-ONT
15h 23m1 stop
15:01 - 12:05ONT-LHR
13h 04m1 stop
£402Finnair
Find Deal
Tue, 29 Oct - Tue, 12 Nov
12:20 - 11:24LGW-ONT
31h 04m2 stops
23:00 - 08:10ONT-LGW
49h 10m2 stops
£422American Airlines
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Wed, 11 Sep - Sat, 14 Sep
11:35 - 19:22LHR-ONT
15h 47m1 stop
13:42 - 10:00ONT-LHR
12h 18m1 stop
£434KLM
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Wed, 11 Sep - Wed, 25 Sep
12:30 - 22:28LHR-ONT
16h 58m1 stop
12:45 - 11:10ONT-LHR
14h 25m1 stop
£435KLM
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Wed, 30 Oct - Mon, 11 Nov
10:30 - 17:33LHR-ONT
15h 03m1 stop
08:41 - 06:25ONT-LHR
13h 44m1 stop
£466British Airways
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Mon, 9 Sep - Tue, 17 Sep
12:00 - 18:57LHR-ONT
14h 57m1 stop
10:48 - 08:00ONT-LHR
13h 12m1 stop
£470British Airways
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Wed, 3 Jul - Wed, 10 Jul
11:00 - 16:16LHR-ONT
13h 16m1 stop
13:25 - 10:00ONT-LHR
12h 35m1 stop
£475Virgin Atlantic
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Wed, 19 Jun - Wed, 26 Jun
09:30 - 22:05LHR-ONT
19h 35m2 stops
13:00 - 09:40ONT-LHR
12h 40m1 stop
£536United Airlines
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Sat, 2 Nov - Sat, 9 Nov
10:55 - 16:36LHR-ONT
13h 41m1 stop
13:20 - 10:00ONT-LHR
12h 40m1 stop
£570Virgin Atlantic
Find Deal
Tue, 21 May - Tue, 28 May
16:15 - 22:45LHR-ONT
14h 30m1 stop
13:47 - 12:20ONT-LHR
14h 33m2 stops
£603United Airlines
Find Deal
Wed, 3 Jul - Tue, 9 Jul

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’s the cheapest day of the week to fly from London to Ontario?

The average price of all flights from London to Ontario clicked on KAYAK for each day over the last 12 months.
When flying from London to Ontario, you should consider leaving on a Wednesday and avoid Sundays if you are looking for the best rates. For your return to London, you’ll find the best rates on Tuesdays and the most expensive ones on Thursdays.

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 November, where tickets cost £461 on average. On the other hand, the most expensive months are August and December, where the average cost of tickets is £833 and £666 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 1 week before departure. For the absolute cheapest price, our data suggests you should book 58 days before departure.

Which airlines provide the cheapest flights from London to Ontario?

The cheapest price for the route for each airline clicked by KAYAK users in the last 72 hours.
In the last 72 hours, the best return deals on flights connecting London to Ontario were found on Finnair (£402) and American Airlines (£422). JetBlue proposed the cheapest one-way flight at £593.

Good to know - Cheap tickets from London to Ontario

Low season

January

High season

July

Cheapest flight

£387
Best time to beat the crowds (17% less expensive on average)
Most popular time to fly (11% more expensive on average)
Flight from London Heathrow 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 £485 for a one-way ticket and £503 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, SkyTeam, and oneworld 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, KLM or Finnair?

    The two airlines most popular with KAYAK users for flights from London to Ontario are KLM and Finnair. With an average price for the route of £487 and an overall rating of 7.8, KLM is the most popular choice. Finnair is also a great choice for the route, with an average price of £646 and an overall rating of 7.7.

  • 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 1377 reviews
7.0Entertainment
8.2Crew
7.5Comfort
6.9Food
7.8Boarding
Airline reviews

All good- I love BA and the professionalism of the crew and pilots.

8.0 ExcellentAnonymous, Apr 2024JFK - LHR
Read more about Finnair reviews

All good- I love BA and the professionalism of the crew and pilots.

Great flight- smooth, nice crew, nice clean aircraft, departed a little late but arrived 10 early.

It was listed on my ticket as Finnair but there was no indication that the flight was Finnair. In fact the number was even different. There were no employees there until exactly 2 hours before so we had to wait in line at Iberia and hope

Sorting on line would have been appreciated Onward information on flights missed No ability to get seating arranged before we got to gate Very unfriendly at gate

I booked the flight with Finnair, which made the arrangements for downloading a boarding pass unnecessarily complicated. I wouldn't do that again. Instead I'd book direct with AA.

Flight ok, but me and other two passengers didn’t have connection with the entertainment in our seats. So, no movies, no games, no music… for 9 hours. The crew just told us that there’s nothing they can do but I noticed during the flight that there were empty seats, so they could have offered to us to change seats. Customer service could be better.

Had a nice flight to London on BA will fly with them again in the future

Finnair cancelled my flight 12 hours prior to leaving for Helsinki. They stated there were mechanical problems. I had to scurry around to find a new flight that would meet my needs for arrival in Helsinki. Luckily I was able to find alternate transportation through Lufthansa/United.

I’m very disappointed, to fly into an airplane for 10 straight hours, and not having a TV even though when I put the ticket I was told that I will have entertainment for the TV. Very disappointed.

Security was a mess at the Helsinki Airport. But I was delighted by the connecting flight waiting for us for JFK.

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.

The delay was an issue. Other than that. Every thing good

Staff didn’t check cabin well for landing seemed more interested in chatting to each other. Food was poor and differed from pre order.

We were in the last group to be called to the flight - which was 30 minutes late taking off. While we were lucky enough to have been given bulkhead seats (due to a medical condition I’d told them about beforehand) the seats weren’t particularly comfortable. A crying baby for the whole trip made things worse, so the crew managed very well with coping. The final thing I’d say was that there wasn’t enough food served during the flight.

Very good. Glad we had Premium for the flight out.

We flew Upper Class from London to The Turks and Caicos. Check in was amazing. Our ldriver too us directly to a special entrance to terminal 3. It took 10 minutes to check in and clear customs. Amazing! The VA lounge is large and comfortable. Boarding the flight was easy and without a wait. The crew was excellent. But the seats were awful, strange and uncomfortable. Having a comfortable flat bed seat is the reason we pays 1000s extra. The VA 787 uses a reverse herringbone configuration. Look it up. You have your back to the window and are facing the aisle with no privacy. Turning the seat into a bed requires assistance from the crew so not very spontaneous. . The food was ok. A bit tasteless and meager portions. Had to pay for WiFi. I believe VA has other configuration on their dream airbus flights. Lots of stuff about all this on YouTube where you can see what I have been describing. I can not recommend taking VA on a long flight with these seats.

From the start everything was perfectly fine. First meal was fantastic. Breakfast needs a lot of work and food was overcooked and not very nice for breakfast. Staff were fantastic friendly nice they came round and check we need anything else to eat or drink

Check in etc was very good. As for on the plane, it was like flying in a freezer. It was so cold, i have flown for years and never been so cold on a plane. Staff on board said its always cold when flying which is a load of rubbish. They wouldnt put any heating on and now i have the flu because of this .

I’ve had a couple flights this week on United that were delayed by an hour or more

Should have video screens Plane audio was poor and without wired connection hard to understand crew. Should serve more than just cups of water and pretzels on six hour flight. Did not see crew rest of flight. Fix charging sockets to retain charging blocks.

My bag was lost with my medicine and I am very inconvenienced. I don’t know what happened, however I want you to do a better job on getting people’s bag back

The food that was offered based on class level of your ticket was absolutely ridiculous and disgusting. They didn't even hot tea to serve, the food was horrible. On our departure flight I was seated in premium plus economy and considering the cost of the flight the food was literally some of the worst I've ever eaten. On the return flight I sat in economy with extra leg room and was given a thin little throw "blanket" and a flimsy little pillow. The air condition was on artic and the seating arrangement wasn't really worth the money. The seat didn't recline good enough and the foot rest was laughable. Total waste.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the locked room where it was being kept.

Generally good but there wasn’t any staff available when my luggage didn’t appear at baggage claim in Fresno. It took about half an hour to locate a staff member to open up the room where it was being kept.

Do not like the feeling of being in the basic economy. Everyone should feel good no matter what.

Our original business class flight was cancelled so we not only downgraded but we were also spread out across the plane not sitting together in separate middle seats. My poor kids were scared and couldn’t see me on the flight and the crew wasn’t sensitive to the situation and what the airlines did to us. Very dissatisfied with United airlines.

The WiFi didn’t work and the seats are too close together. Very uncomfortable.

The bad part was 2 hour delay and we were seating in the airplane it was getting hot and uncomfortable But after they fixed the problem everything went so smooth Crew were amazing very nice polite and caring

Horrible flight attendant in back of economy that screamed at me, have already reported to United. Horrible food - for Gluten free, why would you assume the person is vegetarian? I was served some kind of horrible curry bean paste and multiple cold rolls and soggy vegetables with no seasoning... um no!

I was at the airport on time , I checked in my luggage . The plane was delayed and the gate was change. The flight board did not give information . I did not get chance to fly. I am going to make a claim for it

It was a short flight, no real service (which is okay). Very bumpy because of weather.

I'm Canaadian. I hate Air Canada. I used to give them a pass on their international service. No longer, They suck across the board now! Old planes, exhausted staff bad food and shitty entertainment. Your seats need reupholstered! Start with that...

Good experience. Food was great and passengers helped rearrange seats so our family could be seated together

Great flight. Left on time, not very crowded. Quiet and the right temperature.

No eye patches , socks given out for overnight flight! The snack on the short haul was a cube of chocolate! The seat was uncomfortable for a long haul - not enough cushioning!

I paid a lot of money for seat selection and was miserable for flight duration

Lufthansa lost our luggage. After a lot of chasing on our part we got it back. The main problem is that there was no office in Bogota to help us outside of flighttimes. The customer service phone lines had no data on our luggage. I think Lufthansa need to invest in managing communications over lost luggage or this will end with everyone taking more luggage out of hold.

I would have preferred something lighter for the second meal. Maybe a small sandwich .

They cancelled our flight the morning of departure at 4:30am.

my original flight was cancelled the previous day, and i was rescheduled onto this flight, which left much earlier in the morning, impacting my previous evening and requiring me to get up much earlier in the morning to get to the airport online. This practice happens way way way too much, and it seems on every airline, though AA is probably the worst.

The crew was very attentive and kept busy serving a variety of treats!

Offered vegetable curry when it was actually tofu which I don’t care for.

The flight was good the crew excellent…but take off delayed three hours!!!

Both mine and my husband's chairs were broken. Also it took 2 hours to get our bags after our flight which was wild.

perhaps eye contact with the cabin crew, instead of abruptness and an impatience to serve.

Not enough trash pickups throughout the flight. Everything else was great.

Overall good, the gluten free food is very hit/miss though and you must tell them you have an allergy days in advance.

Book cheap flights from London to Ontario

Cheapest flights to Ontario from London found in 2024

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.
23/9Mon
3 stops
34h 27mLHR-ONT
£387
23/9Mon
3 stops
35h 22mLHR-ONT
£418
20/6Thu
3 stops
33h 09mLGW-ONT
£444
6/11Wed
1 stopKLM
13h 27mLHR-ONT
£1,170
23/9Mon
2 stopsLufthansa
20h 16mLCY-ONT
£1,190
18/9Wed
1 stopLufthansa
18h 56mLHR-ONT
£1,190
27/10Sun
1 stopBritish Airways
16h 48mLHR-ONT
£1,235
2/7Tue
1 stopVirgin Atlantic
13h 22mLHR-ONT
£1,245
1/7Mon
1 stopBritish Airways
14h 55mLHR-ONT
£1,257
11/7Thu
2 stopsKLM
18h 37mLGW-ONT
£1,270

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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.
15/5Wed
multi-stopUnited Airlines
19h 34mLHR-ONT
22/5Wed
multi-stopUnited Airlines
16h 40mONT-LHR
£754
15/5Wed
multi-stopUnited Airlines
19h 34mLHR-ONT
22/5Wed
multi-stopUnited Airlines
15h 55mONT-LHR
£755
14/5Tue
multi-stopBritish Airways
15h 03mLHR-ONT
21/5Tue
multi-stopBritish Airways
14h 00mONT-LHR
£794
14/5Tue
multi-stopKLM
13h 41mLHR-ONT
22/5Wed
multi-stopKLM
12h 40mONT-LHR
£798
14/5Tue
multi-stopFinnair
16h 08mLHR-ONT
23/5Thu
multi-stopFinnair
14h 40mONT-LHR
£816
11/5Sat
multi-stopFinnair
17h 47mLHR-ONT
18/5Sat
multi-stopFinnair
25h 01mONT-LHR
£817
12/5Sun
multi-stopBritish Airways
16h 08mLHR-ONT
2/6Sun
multi-stopBritish Airways
24h 06mONT-LHR
£885
14/5Tue
multi-stopKLM
13h 41mLHR-ONT
18/5Sat
multi-stopKLM
12h 40mONT-LHR
£984
14/5Tue
multi-stopAir France
15h 21mLHR-ONT
16/5Thu
multi-stopAir France
14h 20mONT-LHR
£2,660
12/5Sun
multi-stopAir France
13h 41mLHR-ONT
14/5Tue
multi-stopAir France
14h 20mONT-LHR
£2,856

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London - Ontario Flights

Destination:

Ontario (ONT)United States

Return flight deals:

Ontario - London

Cabin classes: