£281 Find Cheap Flights from Ontario to the United Kingdom

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Ontario to the United Kingdom departing on 27/8. 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.
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Best United Kingdom Flight Deals from Ontario

Cheapest return prices found by our users on KAYAK in the last 72 hours

London
London1 stop£471
Edinburgh
Edinburgh2 stops£478
Birmingham
Birmingham2 stops£595
Belfast
Belfast2 stops£924
Newcastle upon Tyne
Newcastle upon Tyne2 stops£1,352
London
London1 stop£471
Edinburgh
Edinburgh2 stops£478
Birmingham
Birmingham2 stops£595
Belfast
Belfast2 stops£924
Newcastle upon Tyne
Newcastle upon Tyne2 stops£1,352

Cheap Flight Deals from Ontario to the United Kingdom (ONT-GB0)

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

Recommended return flight deals departing in the coming months from the most popular airlines that fly from Ontario to the United Kingdom.
Discover the best prices for you by selecting your travel dates on KAYAK.
British Airways Logo
10:53 - 14:40ONT-GLA
19h 47m2 stops
British Airways Logo
20:50 - 16:06GLA-ONT
27h 16m2 stops
£458British Airways
Find Deal
Mon, 4 Aug - Mon, 18 Aug
Lufthansa Logo
13:15 - 09:40ONT-LHR
12h 25m1 stop
Lufthansa Logo
14:50 - 20:33LHR-ONT
13h 43m1 stop
£471Lufthansa
Find Deal
Tue, 23 Sep - Fri, 24 Oct
Air Canada Logo
05:05 - 10:00ONT-LHR
20h 55m2 stops
Air Canada Logo
09:30 - 12:32LHR-ONT
35h 02m2 stops
£490Air Canada
Find Deal
Sun, 17 Aug - Tue, 2 Sep
United Airlines Logo
05:10 - 09:40ONT-LHR
20h 30m1 stop
United Airlines Logo
17:40 - 22:30LHR-ONT
36h 50m2 stops
£495United Airlines
Find Deal
Tue, 14 Oct - Fri, 24 Oct
KLM Logo
09:55 - 09:50ONT-LHR
15h 55m1 stop
KLM Logo
12:30 - 22:41LHR-ONT
17h 11m1 stop
£507KLM
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Wed, 15 Oct - Wed, 29 Oct
Delta Logo
12:00 - 13:30ONT-LHR
17h 30m1 stop
Delta Logo
06:15 - 22:43LHR-ONT
24h 28m2 stops
£508Delta
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Wed, 13 Aug - Sat, 30 Aug
Delta Logo
13:00 - 13:10ONT-LHR
16h 10m2 stops
Delta Logo
11:45 - 22:41LHR-ONT
18h 56m2 stops
£518Delta
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Wed, 10 Sep - Sat, 20 Sep
United Airlines Logo
07:00 - 08:25ONT-EDI
17h 25m1 stop
United Airlines Logo
09:00 - 17:29EDI-ONT
40h 29m2 stops
£523United Airlines
Find Deal
Wed, 30 Jul - Tue, 19 Aug
Air Canada Logo
09:35 - 09:35ONT-LHR
16h 00m2 stops
Air Canada Logo
13:00 - 13:10LHR-ONT
31h 10m2 stops
£528Air Canada
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Thu, 16 Oct - Tue, 28 Oct
KLM Logo
09:55 - 09:50ONT-LHR
15h 55m1 stop
KLM Logo
09:20 - 22:41LHR-ONT
20h 21m1 stop
£545KLM
Find Deal
Fri, 17 Oct - Tue, 28 Oct
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KAYAK's insights & trends for Ontario to the United Kingdom flights

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

What is the cheapest month to fly from Ontario to the United Kingdom?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Ontario to the United Kingdom, 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 Ontario to the United Kingdom is October, when tickets cost £500 (return) on average. On the other hand, the most expensive months are June and December, when the average cost of return tickets is £829 and £661 respectively.

How far in advance should I book a flight from Ontario to the United Kingdom?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from Ontario to the United Kingdom, 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 Ontario to the United Kingdom, you should book around 3 weeks before departure. For the absolute cheapest price, our data suggests you should book 16 weeks before departure.


Good to know - Cheap tickets from Ontario to the United Kingdom

Low seasonNovember
High seasonApril
Cheapest flight£281
Best time to beat the crowds (19% less expensive on average)
Most popular time to fly and prices are also 3% lower on average.
Flight from Ontario to London Heathrow Airport

FAQs - booking United Kingdom flights

  • How does KAYAK find such low prices on flights from Ontario to the United Kingdom?

    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 Ontario to the United Kingdom.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Ontario to the United Kingdom 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 Ontario to the United Kingdom?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional return ticket. You could then fly from Ontario to the United Kingdom with an airline and back with another airline.

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

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

  • What is the cheapest time of day to fly to the United Kingdom?

    The cheapest time of day to fly to the United Kingdom is generally in the afternoon, when retur flights cost £710 on average. Morning departures are around 12% more expensive than evening flights, on average. The most expensive time of day to fly to the United Kingdom is generally in the morning, which is peak travel time and where the average cost of a ticket is £865.

Top airlines flying from Ontario to the United Kingdom

Need help choosing which airline to fly with from Ontario to the United Kingdom? 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.
8.0
DeltaOverall score based on 7934 reviews
7.3Food
7.9Entertainment
8.5Crew
7.9Comfort
8.2Boarding
Airline reviews

Delta flight was on time, seats were comfortable, and crew was nice.

8.0 ExcellentAnonymous, Apr 2025LAX - DEN
Read more Delta reviews

Delta flight was on time, seats were comfortable, and crew was nice.

Bathrooms dirty sinks clogged. No one seemed to clean them. Plane very old

Thank you for not flipping the plane on the run way. You guys get a 5 star rating for the flight!!!

Boarding is, as it always is… horrible. Gate lice. Slow moving zones. Too many people with carry ons

It was terrible, if they ran flights on time it would make a big difference.

Delta seems to be improving in many areas, except they are super bad with the food available. Bring back normal food service on long flights.

I actually received a notification from kayak on email but not one by text from Delta when my departure gait changed and I almost missed my flight

New boarding doesn't make sense. Filling front first is slow.

Delta flight was great from the check in all the way to arrival. However, I had a very bad experience. I requested a wheelchair and the wheelchair employee that went to pick me up from the plane in Boston to bring me to the baggage claims told me I have to pay him. I was under the impression that it was a free service and I usually give tips but the person forced me to pay and since I said no because I was upset with his demand when my daughter walked in to pick me up he demanded payment from my daughter who paid him thinking maybe now it is a charged service.

Horrible. Grateful to be alive but spent 13 hours at airport only to return back to my familys house and flight changed to next day. They tried to fix a part on plane, had no back up plane and after 10 hours , reattempted the flight and it STILL wasn't fixed. We got a meal voucher and rescheduled flight but there should be some other compensation for the 15 hours spent in airport

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

This portion of the flight was through Indigo. A local carrier. So all economy seating. No real service some refreshments for purchase standard economy stuff.

You should not have to pay for WiFi in business class

Transfer at Amsterdam airport is very convenient and the airport is easy to navigate. Boarding was also quick and easy. Cabin crew were excellent and the meals were good, although lacking in options.

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

This fight left ahead of time which meant it arrived early which was great. Staff were very professional, but as with all these Short hop Flights the food was a disappointing snack There was no entertainment on this flight, but I did not expect any

I flew premium economy and this was a good option. Although the seats didn’t recline much, I was able to get some sleep with my head propped against the window. The food was good and the entertainment was wonderful The staff were very attentive and professional

Overall very poor. Flight was disorganised, staff were rude and this is my second experience with KLM that I've had baggage go missing. It feels like, if you are an economy customer, KLM staff do not show you any care. I shall never fly with KLM again. Worst airline in Europe

Everything you need to know for your flight from Ontario to the United Kingdom

Information on your arrival and departure airports

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