LHR - ONT

$505 Find Cheap Flights from London Heathrow Airport to Ontario

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Heathrow to Ontario departing on 6/3. 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

KAYAK searches hundreds of travel sites at once for deals on flights to Ontario

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from London to Ontario, as well as popular online travel agencies
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Flights Deals

Cheap Flights from Heathrow to Ontario (LHR-ONT)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Heathrow 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 for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Heathrow to Ontario

Tue, Jun 3 - Mon, Jun 9
British Airways Logo
8:20 am - 6:36 pmLHR-ONT
18h 16m1 stop
British Airways Logo
12:49 pm - 12:45 pmONT-LHR
15h 56m1 stop
$505British Airways
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Wed, Jun 11 - Wed, Jun 18
British Airways Logo
11:15 am - 6:12 pmLHR-ONT
14h 57m1 stop
British Airways Logo
11:59 pm - 6:25 amONT-LHR
22h 26m1 stop
$507British Airways
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Mon, Sep 8 - Mon, Sep 15
KLM Logo
11:20 am - 7:42 pmLHR-ONT
16h 22m1 stop
KLM Logo
1:00 pm - 9:50 amONT-LHR
12h 50m1 stop
$514KLM
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Thu, Sep 25 - Mon, Oct 6
American Airlines Logo
3:40 pm - 9:40 pmLHR-ONT
14h 00m1 stop
American Airlines Logo
5:02 pm - 2:40 pmONT-LHR
13h 38m1 stop
$518American Airlines
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Tue, Jun 3 - Mon, Jun 9
Virgin Atlantic Logo
2:45 pm - 11:42 pmLHR-ONT
40h 57m2 stops
Virgin Atlantic Logo
6:25 am - 11:20 amONT-LHR
20h 55m1 stop
$530Virgin Atlantic
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Thu, Oct 2 - Wed, Oct 8
Virgin Atlantic Logo
1:25 pm - 11:46 pmLHR-ONT
18h 21m2 stops
Virgin Atlantic Logo
9:55 am - 11:20 amONT-LHR
17h 25m2 stops
$534Virgin Atlantic
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Wed, Jul 16 - Fri, Aug 1
KLM Logo
11:00 am - 4:28 pmLHR-ONT
13h 28m1 stop
KLM Logo
1:15 pm - 9:50 amONT-LHR
12h 35m1 stop
$542KLM
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Wed, Jun 11 - Thu, Sep 18
United Airlines Logo
9:30 am - 9:10 pmLHR-ONT
19h 40m2 stops
United Airlines Logo
1:42 pm - 10:25 amONT-LHR
12h 43m1 stop
$631United Airlines
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Thu, Sep 11 - Wed, Sep 24
United Airlines Logo
10:35 am - 5:37 pmLHR-ONT
15h 02m1 stop
United Airlines Logo
5:10 am - 9:40 amONT-LHR
20h 30m1 stop
$723United Airlines
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Sat, Jul 12 - Wed, Jul 23
American Airlines Logo
3:40 pm - 9:38 pmLHR-ONT
13h 58m1 stop
American Airlines Logo
4:45 pm - 12:50 pmONT-LHR
12h 05m1 stop
$927American Airlines
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KAYAK's insights & trends for Heathrow to Ontario flights

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

The average price of all round-trip flights from London Heathrow Airport to Ontario clicked on KAYAK for each day over the last 12 months.

Your flight ticket price will generally be cheaper if you fly to Ontario on a Tuesday and more expensive on a Monday. On your return trip to London Heathrow Airport, you should consider flying back on a Wednesday, and avoid Saturdays for better deals.

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

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from London Heathrow Airport 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 Heathrow Airport to Ontario is February, where tickets cost $589 (return) on average. On the other hand, the most expensive months are August and April, where the average cost of round-trip tickets is $968 and $839 respectively.

How far in advance should I book a flight from London Heathrow Airport to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights from London Heathrow Airport to Ontario, 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 London Heathrow Airport to Ontario, you should book around 2 weeks before departure. For the absolute cheapest price, our data suggests you should book 21 weeks before departure.

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Good to know

Low seasonJuly
High seasonNovember
Cheapest flight$505
Best time to beat the crowds with an average 0% drop in price.
Most popular time to fly and prices are also 9% lower on average.
Flight from London Heathrow Airport to Ontario

When to book flights from Heathrow to Ontario

Are your dates flexible? Find out the best times to travel from Heathrow to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips 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 London Heathrow Airport to Ontario flights

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

    In the last 3 days, the lowest price for a flight from London Heathrow Airport to Ontario was $577 for a one-way ticket and $505 for a round-trip.

  • Do I need a passport to fly between London Heathrow Airport and Ontario?

    Yes, you'll most likely have to show a valid passport before boarding the plane in London Heathrow Airport and on arrival in Ontario.

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

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

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

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

  • Which airline alliances offer flights from London Heathrow Airport to Ontario?

    oneworld, Star Alliance, and SkyTeam are the airline alliances operating flights between London Heathrow Airport and Ontario, with oneworld being the most commonly used for this route.

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

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

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

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Ontario with an airline and back to London Heathrow Airport with another airline. Booking your flights between London Heathrow Airport and ONT can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from London Heathrow Airport 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 Heathrow Airport up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Top airline flying from Heathrow 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 Heathrow 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.
7.4
United AirlinesOverall score based on 8731 reviews
7.1Entertainment
6.6Food
8.1Crew
7.3Comfort
7.7Boarding
Airline reviews

I needed to make changes to my flights. When I called customer service, they assisted me with care professionalism.

10.0 ExcellentMohammad Hassan Mirzai, May 2025HKG - SFO
Read more United Airlines reviews

I needed to make changes to my flights. When I called customer service, they assisted me with care professionalism.

A bit rush for transit. Food and entertainment are not available

Wonderful and fast TSA checkpoint. The line was fast and our gate was close by

The gate was too far away for the connecting flight

Generally good. The aisles have gotten narrower which can slow down boarding. Flight crew was great! Healthier complimentary snacks would be appreciated. Due to earthquake in San Francisco we had to circle in air space for a bit but then had a smooth landing. I laud the flight crew for their patience ;)

We tried to upgrade to economy premium but were told this was not possible as we had booked through United Airlines (and Air Canada was operating the flight). This seemed silly given there was ample space in economy premium. Additionally, we had to wait almost 1.5 hours upon arrival to taxi to the gate. Otherwise, the crew were very pleasant and passengers were friendly.

headphone jack didnt work for the first flight and not much variety

The agents was very rude and they charged me $50 for a carry-on bag saying that it was too big and then I saw someone going on a plane with the same size bag as me

For the most part united was a good experience, how ever when they came by with the snacks and water, they completely passed by my wife and I. As we were in separate rows. On a 5 hr flight we were not offered water

Fantastic crew. Flight was delayed at last minute but we were given updates every 20 minutes and the crew was so friendly and considerate. I miss the touch screens on the back of the seats, wish they would bring that back though.

Everything you need to know for your flight from Heathrow to Ontario

Information on your arrival and departure airports

London Heathrow Airport (LHR)
Ontario (ONT)

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