ONT - LHR

£223 Find Cheap Flights from Ontario to London Heathrow Airport – Compare and Save

1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest return fare
£568
Typical prices: £644-£901
United Airlines
Mon 1/3Thu 4/3
ONT - LHR • 2 stops
Cheapest one-way flight
£223
Multiple Airlines
Fri 29/1
ONT - LHR • 3 stops
Direct flights
Not available
There are currently no direct flights between Ontario and Heathrow. You’ll need at least 1 connection.
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When to travel
Cheapest • 34% price drop
Most popular
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Flight Deals

Cheap Flights from Ontario to Heathrow (ONT-LHR)

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

Recent return flight deals from Ontario to Heathrow

Mon, 1 Mar - Thu, 4 Mar
United Airlines Logo
13:45 - 10:15ONT  Ontario-LHR London Heathrow
36h 30m2 stops Denver Intl Houston George Bush Intcntl
United Airlines Logo
09:00 - 20:19LHR  London Heathrow-ONT Ontario
19h 19m2 stops Zurich San Francisco
£568United Airlines
Wed, 2 Dec - Wed, 9 Dec
Multiple Airlines Logo
06:00 - 19:30ONT  Ontario-LHR London Heathrow
29h 30m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
12:15 - 22:17LHR  London Heathrow-ONT Ontario
18h 02m2 stops Reykjavik Keflavik Intl Denver Intl
£599Multiple Airlines
Wed, 25 Nov - Wed, 2 Dec
Multiple Airlines Logo
06:45 - 19:30ONT  Ontario-LHR London Heathrow
28h 45m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
20:35 - 00:17LHR  London Heathrow-ONT Ontario
35h 42m2 stops Reykjavik Keflavik Intl Denver Intl
£601Multiple Airlines
Thu, 3 Dec - Sun, 13 Dec
Multiple Airlines Logo
06:00 - 10:50ONT  Ontario-LHR London Heathrow
20h 50m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
20:35 - 00:20LHR  London Heathrow-ONT Ontario
35h 45m2 stops Reykjavik Keflavik Intl Denver Intl
£602Multiple Airlines
Sun, 7 Mar - Sat, 13 Mar
Multiple Airlines Logo
16:25 - 13:35ONT  Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
Multiple Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
£604Multiple Airlines
Wed, 10 Feb - Wed, 24 Feb
Multiple Airlines Logo
14:23 - 12:15ONT  Ontario-LHR London Heathrow
13h 52m1 stop Dallas/Fort Worth
Multiple Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
15h 54m1 stop Seattle/Tacoma Intl
£605Multiple Airlines
Wed, 7 Apr - Wed, 19 May
Multiple Airlines Logo
16:52 - 14:20ONT  Ontario-LHR London Heathrow
13h 28m1 stop Phoenix Sky Harbor Intl
Multiple Airlines Logo
17:00 - 23:59LHR  London Heathrow-ONT Ontario
14h 59m1 stop Seattle/Tacoma Intl
£607Multiple Airlines
Mon, 8 Mar - Wed, 24 Mar
Multiple Airlines Logo
14:29 - 12:00ONT  Ontario-LHR London Heathrow
13h 31m1 stop Dallas/Fort Worth
Multiple Airlines Logo
14:45 - 22:39LHR  London Heathrow-ONT Ontario
14h 54m1 stop Seattle/Tacoma Intl
£608Multiple Airlines
Mon, 5 Apr - Wed, 14 Apr
Alaska Airlines Logo
12:00 - 15:05ONT  Ontario-LHR London Heathrow
19h 05m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:00 - 11:09LHR  London Heathrow-ONT Ontario
26h 09m1 stop Seattle/Tacoma Intl
£612Alaska Airlines
Wed, 2 Dec - Wed, 9 Dec
Multiple Airlines Logo
06:00 - 19:30ONT  Ontario-LHR London Heathrow
29h 30m2 stops Denver Intl Reykjavik Keflavik Intl
Multiple Airlines Logo
12:15 - 22:17LHR  London Heathrow-ONT Ontario
18h 02m2 stops Reykjavik Keflavik Intl Denver Intl
£612Multiple Airlines
Booking Insights

KAYAK’s insights & trends for Ontario to Heathrow flights

Get data-powered insights and trends into flights from Ontario to Heathrow 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 London Heathrow Airport?

The cheapest month for flights from Ontario to London Heathrow Airport is December, where tickets cost £543 (return) on average. On the other hand, the most expensive months are June and July, where the average cost of round-trip tickets is £1,187 and £1,027 respectively.

Good to know - Cheap tickets from Ontario to London Heathrow Airport

Low season

January

Cheapest flight

£223
Best time to beat the crowds but there is an average 15% increase in price.
Most popular time to fly (25% more expensive on average)
Flight from Ontario to London Heathrow Airport

When to book flights from Ontario to Heathrow

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

FAQs for booking Ontario to London Heathrow Airport flights

  • What is the cheapest flight from Ontario to London Heathrow Airport?

    In the last 5 days, the lowest price for a flight from Ontario to London Heathrow Airport was £223 for a one-way ticket and £568 for a return.

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

    Ontario airport is called Ontario and the only airport in London Heathrow Airport is London Heathrow.

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

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

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

    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 Heathrow Airport.

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

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

    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 Heathrow Airport 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 Heathrow Airport?

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

More options for your flight from Ontario to Heathrow

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