$395 Find Cheap Flights from the United Kingdom to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 9/8. 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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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 for flights to Ontario, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results for flights to Ontario, as well as popular online travel agencies
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Flights Deals

Cheap Flights from the United Kingdom to Ontario

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

Tue, Jul 15 - Thu, Jul 31
British Airways Logo
4:25 pm - 11:54 pmLHR-ONT
15h 29m1 stop
British Airways Logo
2:40 pm - 2:25 pmONT-LHR
15h 45m1 stop
$528British Airways
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Fri, Nov 7 - Mon, Nov 17
Finnair Logo
11:55 am - 10:00 pmLHR-ONT
18h 05m1 stop
Finnair Logo
12:53 pm - 10:00 amONT-LHR
13h 07m1 stop
$534Finnair
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Sat, Sep 13 - Sat, Sep 20
KLM Logo
11:20 am - 7:42 pmLHR-ONT
16h 22m1 stop
KLM Logo
1:00 pm - 9:50 amONT-LHR
12h 50m1 stop
$561KLM
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Sat, Aug 30 - Fri, Sep 5
Virgin Atlantic Logo
6:15 am - 10:40 pmLHR-ONT
24h 25m2 stops
Virgin Atlantic Logo
7:05 am - 1:30 pmONT-LHR
22h 25m1 stop
$563Virgin Atlantic
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Thu, Jun 19 - Thu, Jun 26
Logo
4:30 pm - 12:13 amLHR-ONT
15h 43m1 stop
Logo
3:56 pm - 1:40 pmONT-LHR
13h 44m1 stop
$571
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Sat, Jun 7 - Sat, Jun 21
KLM Logo
10:55 am - 4:17 pmLHR-ONT
13h 22m1 stop
KLM Logo
1:15 pm - 9:50 amONT-LHR
12h 35m1 stop
$575KLM
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Sat, Aug 30 - Fri, Sep 5
Virgin Atlantic Logo
1:25 pm - 10:42 pmLHR-ONT
17h 17m1 stop
Virgin Atlantic Logo
11:45 am - 1:30 pmONT-LHR
17h 45m1 stop
$577Virgin Atlantic
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Wed, Nov 5 - Wed, Nov 12
Logo
1:00 pm - 10:35 pmLHR-ONT
17h 35m2 stops
Logo
7:00 am - 6:30 amONT-LHR
15h 30m2 stops
$671
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Thu, Jun 19 - Thu, Jun 26
United Airlines Logo
1:40 pm - 9:10 pmLHR-ONT
15h 30m1 stop
United Airlines Logo
1:34 pm - 12:20 pmONT-LHR
14h 46m1 stop
$727United Airlines
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Sun, Jul 13 - Tue, Nov 4
United Airlines Logo
8:00 am - 8:54 pmLHR-ONT
20h 54m2 stops
United Airlines Logo
5:40 am - 9:40 amONT-LHR
20h 00m1 stop
$795United Airlines
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KAYAK's insights & trends for flights to Ontario

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

What is the cheapest month to fly to Ontario?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for flights 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 to Ontario is February, where tickets cost $556 on average for return flights. On the other hand, the most expensive months are August and July, where the average cost of tickets from the United Kingdom is $1,117 and $914 respectively. For one-way flights, the best month to travel is November with an average price of $631.

How far in advance should I book a flight to Ontario?

To calculate weekly average prices, KAYAK takes all prices for each week before departure over the last year for round-trip flights 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, 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 seasonFebruary
High seasonNovember
Cheapest flight$395
Best time to beat the crowds with an average 19% drop in price.
Most popular time to fly and prices are also 21% lower on average.
Flight from London Gatwick Airport to Ontario

FAQs - booking Ontario flights

  • How far is Ontario Airport from central Ontario?

    You’ll need to travel 3 miles to reach the Ontario city center from Ontario Airport.

  • What is the name of Ontario’s airport?

    All flights to Ontario land at Ontario Airport. The airport code is ONT,and it can also be referred to as Ontario or Ontario Intl.

  • What is the cheapest day to fly to Ontario?

    Based on KAYAK data, the cheapest day to fly to Ontario is Tuesday where round-trip tickets can be as cheap as $602. On the other hand, the most expensive day to fly is Saturday, where round-trip prices are $1,757 on average.

  • How does KAYAK find such low prices on flights 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 to Ontario.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to 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 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 with another airline.

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

    The cheapest time of day to fly to Ontario is generally in the evening, when round-trip flights cost $602 on average. The most expensive time of day to fly to Ontario is generally in the afternoon, which is peak travel time and where the average cost of a ticket is $814.

  • How many direct flights to Ontario are there each week?

    Each week there are around 907 direct flights from within United Kingdom to Ontario. The most common day for departures is Friday, with 16% of flights taking off on this day.

Top tips for finding cheap flights to Ontario

  • Enter your preferred departure airport and travel dates into the search form above to unlock the latest Ontario flight deals.

Top airline flying from the United Kingdom to Ontario

 
See real verified KAYAK customer reviews for airlines flying to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from the United Kingdom to Ontario. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with 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 8745 reviews
7.7Boarding
7.0Entertainment
8.1Crew
7.3Comfort
6.6Food
Airline reviews

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

6.0 Goodmichael, May 2025HNL - SFO
Read more United Airlines reviews

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

Its good expeince but in enternteiment please be like you tube the music i like or movie

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

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)

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