£203 Find Cheap Flights from Ontario to London – Compare and Save

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to London departing on 26/9. 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
1 adult, Economy, 0 bags

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Flight Deals

Cheap Flights from Ontario to London

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights from Ontario to London 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 for you by selecting your travel dates on KAYAK.

Recent return flight deals from Ontario to London

Thu, 8 Oct - Mon, 12 Oct
Multiple Airlines Logo
22:45 - 23:20YUL  Montreal Pierre Elliott Trudeau Intl-LGW London Gatwick
19h 35m2 stops Lisbon Humberto Delgado Barcelona-El Prat
Multiple Airlines Logo
06:50 - 21:10LGW  London Gatwick-YUL Montreal Pierre Elliott Trudeau Intl
19h 20m2 stops Barcelona-El Prat Lisbon Humberto Delgado
£389Multiple Airlines
Fri, 11 Sep - Fri, 18 Sep
Air Transat Logo
22:05 - 09:50YUL  Montreal Pierre Elliott Trudeau Intl-LGW London Gatwick
6h 45mdirect
Air Transat Logo
12:40 - 00:37LGW  London Gatwick-YUL Montreal Pierre Elliott Trudeau Intl
16h 57m1 stop Toronto Pearson Intl
£391Air Transat
Mon, 14 Sep - Mon, 21 Sep
Multiple Airlines Logo
23:40 - 23:55YUL  Montreal Pierre Elliott Trudeau Intl-LGW London Gatwick
19h 15m1 stop Madrid Barajas
Multiple Airlines Logo
06:00 - 16:05LGW  London Gatwick-YUL Montreal Pierre Elliott Trudeau Intl
15h 05m1 stop Madrid Barajas
£392Multiple Airlines
Fri, 25 Sep - Fri, 2 Oct
Air Transat Logo
22:05 - 09:50YUL  Montreal Pierre Elliott Trudeau Intl-LGW London Gatwick
6h 45mdirect
Air Transat Logo
11:35 - 14:15LGW  London Gatwick-YUL Montreal Pierre Elliott Trudeau Intl
7h 40mdirect
£394Air Transat
Thu, 19 Nov - Sun, 22 Nov
Icelandair Logo
19:40 - 19:30YYZ  Toronto Pearson Intl-LHR London Heathrow
18h 50m1 stop Reykjavik Keflavik Intl
Icelandair Logo
20:35 - 18:15LHR  London Heathrow-YYZ Toronto Pearson Intl
26h 40m1 stop Reykjavik Keflavik Intl
£400Icelandair
Tue, 29 Sep - Tue, 13 Oct
Icelandair Logo
20:45 - 20:20YYZ  Toronto Pearson Intl-LHR London Heathrow
18h 35m1 stop Reykjavik Keflavik Intl
Icelandair Logo
21:25 - 19:10LHR  London Heathrow-YYZ Toronto Pearson Intl
26h 45m1 stop Reykjavik Keflavik Intl
£401Icelandair
Tue, 22 Sep - Wed, 30 Sep
Aer Lingus Logo
17:35 - 09:05YYZ  Toronto Pearson Intl-LHR London Heathrow
10h 30m1 stop Dublin
Aer Lingus Logo
09:50 - 15:50LHR  London Heathrow-YYZ Toronto Pearson Intl
11h 00m1 stop Dublin
£411Aer Lingus
Thu, 15 Oct - Sun, 18 Oct
Air Canada Logo
18:00 - 08:20YYZ  Toronto Pearson Intl-LHR London Heathrow
33h 20m1 stop Vienna Intl
Air Canada Logo
08:00 - 12:35LHR  London Heathrow-YYZ Toronto Pearson Intl
33h 35m1 stop Chicago O'Hare Intl
£414Air Canada
Fri, 13 Nov - Sun, 15 Nov
Air Canada Logo
13:15 - 11:20YUL  Montreal Pierre Elliott Trudeau Intl-LHR London Heathrow
17h 05m2 stops Ottawa Toronto Pearson Intl
Air Canada Logo
11:05 - 11:40LHR  London Heathrow-YUL Montreal Pierre Elliott Trudeau Intl
29h 35m1 stop Brussels Bruxelles-National
£417Air Canada
Wed, 26 Aug - Thu, 3 Sep
Aer Lingus Logo
17:35 - 10:20YYZ  Toronto Pearson Intl-LHR London Heathrow
11h 45m1 stop Dublin
Aer Lingus Logo
08:50 - 15:50LHR  London Heathrow-YYZ Toronto Pearson Intl
12h 00m1 stop Dublin
£451Aer Lingus
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Good to know - Cheap tickets from Ontario to London

Low season

January
Best time to beat the crowds (20% less expensive on average)
Most popular time to fly (13% more expensive on average)

Flights from Ontario to London: the best tips from KAYAK users

Insights shared by verified travellers who flew the route from Ontario to London 
Learn how KAYAK collects reviews and tips from users.
CFlew with Air Canada-Feb 2025
Flying from Toronto to London is a long-haul journey, but with the right preparation, it can be a smooth and enjoyable experience. Here are some tips to make your trip more comfortable: Choose the Right Flight – If possible, book an overnight flight (a "red-eye"). This allows you to sleep on the plane and arrive in London in the morning, helping with jet lag. Pack Smart – London’s weather can be unpredictable, so bring layers and a compact umbrella. Also, keep essentials like a travel adapter and charger in your carry-on. Use Luggage Tracking – If flying Air Canada, take advantage of their luggage tracking feature for peace of mind, knowing your bags are on the same flight as you. Stay Hydrated & Bring Snacks – Airplane cabins can be dry, so drink plenty of water. While airlines provide meals, it’s always a good idea to have extra snacks. Manage Jet Lag – Adjust your sleep schedule before departure and try to stay awake until nighttime in London to quickly adapt to the new time zone. Transportation on Arrival – Heathrow and Gatwick have great transport links. The Heathrow Express is the fastest way into central London, while the Tube (Piccadilly Line) is more budget-friendly. Have Your Documents Ready – Ensure your passport is valid, and if required, have your visa or travel authorization (e.g., an ETA for UK entry). With the right prep, your journey will be smooth and enjoyable.
Mohamed ImranFlew with Air Transat-Sept 2024
Pack food for yourself before boarding Air Transat. Blankets, pillows and headphones are not given for free.
GerhardFlew with British Airways-Jun 2024
the lounge is nice. Although the crew at check in will say there are no showers, there are! Check the board for delays
CatherineFlew with Lufthansa-May 2024
Pack light to avoid checked bag fees and then volunteer to place the carry on bag in the hold for no extra cost.
Verified travelerFlew with Air Canada-May 2024
Keep in mind the security gate post security as you cannot return back if you happened to miss collecting all your items
IwonaFlew with Air Canada-Apr 2024
Pack in ur carryon bag and don’t waste ur money to pay for check in
Verified travelerFlew with Lufthansa-May 2024
Bring water and less luggage on board if possible.

FAQs for booking flights from Ontario to London

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

    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 London.

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

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

    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 with an airline and back to Ontario with another airline.

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

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

Travelling to a place near London?

Book flights to London if you plan to visit one of these locations
Gatwick
Milton Keynes
Eastbourne
Hounslow
Luton
Southend-on-Sea
Winchester
Slough
Folkestone
Stansted
Croydon
Newport
Colchester
Chichester
Maidstone
Crawley
Chelmsford
Hastings
Bedford
Richmond

Everything you need to know for your flight to London

Cabin class types available on flights to Ontario

Cabin classes available on flights to London. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
First Class flights to London
Business Class flights to Londonfrom £2,645
Premium Economy Class flights to Londonfrom £1,432
Economy class flights to Londonfrom £349