ONT - LON

£230 Find Cheap Flights from Ontario to London – Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest return fare
£541
Typical prices: £629-£700
Alaska Airlines
Mon 5/10Tue 13/10
ONT - LHR • 1 stop
Cheapest one-way flight
£230
Multiple Airlines
Sat 3/10
ONT - LGW • 2 stops
Direct flights
Not available
There are currently no direct flights between Ontario and London. You’ll need at least 1 connection.
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Top stopover airports
Cheapest • Avg £627 (return)
Shortest trip • 16h 45m (one-way)
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When to travel
Cheapest • 28% price drop
Most popular
Good to know
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Cheap Flights from Ontario to London (ONT-LON)

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals from Ontario to London

Mon, 5 Oct - Tue, 13 Oct
Alaska Airlines Logo
14:13 - 15:05ONT  Ontario-LHR London Heathrow
16h 52m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 13:16LHR  London Heathrow-ONT Ontario
28h 16m1 stop Seattle/Tacoma Intl
£541Alaska Airlines
Sun, 20 Sep - Tue, 6 Oct
Virgin Atlantic Logo
12:19 - 11:20ONT  Ontario-LHR London Heathrow
15h 01m1 stop Atlanta Hartsfield-Jackson
Virgin Atlantic Logo
11:40 - 22:43LHR  London Heathrow-ONT Ontario
19h 03m1 stop Seattle/Tacoma Intl
£543Virgin Atlantic
Mon, 26 Oct - Tue, 3 Nov
Alaska Airlines Logo
11:13 - 12:20ONT  Ontario-LHR London Heathrow
18h 07m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:45 - 11:18LHR  London Heathrow-ONT Ontario
28h 33m1 stop Seattle/Tacoma Intl
£544Alaska Airlines
Mon, 26 Oct - Tue, 3 Nov
Delta Logo
06:20 - 10:40ONT  Ontario-LHR London Heathrow
21h 20m1 stop Seattle/Tacoma Intl
Delta Logo
06:20 - 22:43LHR  London Heathrow-ONT Ontario
24h 23m2 stops Paris Charles de Gaulle Seattle/Tacoma Intl
£545Delta
Mon, 26 Oct - Tue, 3 Nov
Delta Logo
09:45 - 11:40ONT  Ontario-LHR London Heathrow
18h 55m2 stops Salt Lake City Atlanta Hartsfield-Jackson
Delta Logo
06:30 - 22:43LHR  London Heathrow-ONT Ontario
24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
£548Delta
Tue, 6 Oct - Thu, 8 Oct
Alaska Airlines Logo
11:13 - 15:05ONT  Ontario-LHR London Heathrow
19h 52m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 23:42LHR  London Heathrow-ONT Ontario
14h 42m1 stop Seattle/Tacoma Intl
£551Alaska Airlines
Sun, 4 Oct - Tue, 20 Oct
Delta Logo
11:54 - 11:20ONT  Ontario-LHR London Heathrow
15h 26m1 stop Seattle/Tacoma Intl
Delta Logo
20:05 - 11:06LHR  London Heathrow-ONT Ontario
23h 01m2 stops New York John F Kennedy Intl Atlanta Hartsfield-Jackson
£553Delta
Sat, 3 Oct - Wed, 21 Oct
Delta Logo
18:00 - 11:20ONT  Ontario-LHR London Heathrow
33h 20m1 stop Seattle/Tacoma Intl
Delta Logo
11:40 - 22:43LHR  London Heathrow-ONT Ontario
19h 03m1 stop Seattle/Tacoma Intl
£554Delta
Mon, 5 Oct - Wed, 21 Oct
Alaska Airlines Logo
14:13 - 15:05ONT  Ontario-LHR London Heathrow
16h 52m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 10:17LHR  London Heathrow-ONT Ontario
25h 17m1 stop Seattle/Tacoma Intl
£555Alaska Airlines
Wed, 14 Oct - Wed, 21 Oct
Alaska Airlines Logo
14:13 - 15:05ONT  Ontario-LHR London Heathrow
16h 52m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 10:17LHR  London Heathrow-ONT Ontario
25h 17m1 stop Seattle/Tacoma Intl
£556Alaska Airlines
Booking Insights

KAYAK’s insights & trends for Ontario to London flights

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

How much is a return flight from Ontario to London?

Flight prices are below average for this route right now.

Flights to London from Ontario usually cost between £680 and £856 in October.
The lowest price found in the past 5 days was £541 on Alaska Airlines (5 Oct–13 Oct).

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

The cheapest month for flights from Ontario to London is February, where tickets cost £483 (return) on average. On the other hand, the most expensive months are July and June, where the average cost of round-trip tickets is £979 and £920 respectively.

Good to know - Cheap tickets from Ontario to London

Low season

February

Cheapest flight

£230
Best time to beat the crowds (23% less expensive on average)
Most popular time to fly (48% more expensive on average)
Flight from Ontario to London Gatwick Airport

When to book flights from Ontario to London

Are your dates flexible? Find out the best times to travel from Ontario to London based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price

FAQs for booking flights from Ontario to London

  • How can I get to the city center by public transport after my flight from Ontario to London?

    Upon arrival at London Heathrow Airport from Ontario, you can easily reach the city center using public transportation. Take the Heathrow Express train to Paddington Station, which operates every 15 minutes. From Paddington, you can transfer to the London Underground and take the Bakerloo Line or Circle Line to reach the city center.

  • Can I pre-book my seat on WestJet flights from Ontario to London?

    Yes, you can pre-book your seat on WestJet flights from Ontario to London. WestJet offers the option to select your preferred seat in advance, allowing you to secure your desired seating arrangement for a more comfortable journey. By accessing their online booking portal or contacting their customer service, you can make seat reservations according to your preferences and availability.

  • Which kid-friendly amenities does WestJet have on flights from Ontario to London?

    WestJet offers several kid-friendly amenities on flights from Ontario to London. These amenities include children's entertainment options such as movies, TV shows, and games suitable for different age groups. They also provide complimentary activity packs with coloring books, crayons, and puzzles to keep young travelers engaged during the flight.

  • What are the baggage restrictions when flying Virgin Atlantic from Ontario to London?

    The baggage restrictions when flying Virgin Atlantic from Ontario to London include a checked baggage allowance of two pieces weighing up to 50 lbs each in Economy class. Additionally, passengers are allowed one carry-on bag weighing up to 22 lbs and one personal item such as a laptop or handbag.

  • What is the cheapest flight from Ontario to London?

    In the last 5 days, the lowest price for a flight from Ontario to London was £230 for a one-way ticket and £541 for a return.

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

    When flying out of Ontario you will be using Ontario. You will be landing at one of these airports: London Gatwick or London Heathrow.

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

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

  • 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.

KAYAK’s top tips for finding a cheap flight from Ontario to London

  • Common layover options for Air Canada flights from Ontario (ONT) to London (LON) may include stopovers in major hub cities such as Toronto, Montreal, or Ottawa. These layovers often provide convenient connections for passengers, allowing them to change planes and continue their journey to London.
  • Additionally, Air Canada offers a special food service called "Chef's Menu" on its flights from Ontario to London. Passengers can enjoy a delectable selection of culinary delights prepared by renowned chefs. The menu features a range of gourmet dishes using fresh, locally sourced ingredients, ensuring a delightful dining experience in the skies. From appetizers to main courses and desserts, Air Canada's Chef's Menu promises to satisfy the taste buds of travelers throughout their journey.
  • Air Canada offers a variety of in-flight entertainment options on its flights from Ontario to London. Passengers can enjoy a selection of movies, TV shows, and music, with a wide range of genres to choose from. Additionally, the airline provides personal screens with touch controls, offering a seamless and enjoyable viewing experience.
  • WestJet assists passengers with disabilities traveling from Ontario to London. They offer wheelchair assistance, accessible seating options, and priority boarding. Passengers can request special services such as mobility aids or medical equipment during their journey. WestJet's trained staff is available to ensure a comfortable and safe travel experience for passengers with disabilities, addressing their specific needs and providing necessary support throughout the journey.
  • You can change your seat when flying with WestJet from Ontario to London. Seat changes are subject to availability, and you can make the change either during the booking process or by accessing your reservation online. Alternatively, you can contact WestJet's customer service for assistance with seat changes.

More options for your flight from Ontario to London

Complete your trip to London with a hotel stay or car hire