$436 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 4/29. 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

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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Flight 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

Wed, Apr 15 - Wed, Apr 22
United Airlines Logo
7:25 am - 5:47 pm
LHR
-
ONT
18h 22m
2 stops
United Airlines Logo
6:49 pm - 11:10 am
ONT
-
LHR
32h 21m
1 stop
$601United Airlines
Fri, May 8 - Tue, May 12
United Airlines Logo
10:50 am - 10:59 pm
LHR
-
ONT
20h 09m
2 stops
United Airlines Logo
6:00 am - 2:10 pm
ONT
-
LHR
24h 10m
1 stop
$603United Airlines
Tue, Apr 14 - Tue, Apr 21
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$618British Airways
Tue, Apr 14 - Fri, Apr 24
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$620British Airways
Mon, May 4 - Sat, May 9
American Airlines Logo
2:00 pm - 11:34 am
LGW
-
ONT
29h 34m
2 stops
American Airlines Logo
11:59 pm - 6:50 am
ONT
-
LGW
22h 51m
2 stops
$650American Airlines
Sat, Apr 25 - Sat, May 9
American Airlines Logo
12:20 pm - 10:05 am
LGW
-
ONT
29h 45m
2 stops
American Airlines Logo
11:59 pm - 6:50 am
ONT
-
LGW
22h 51m
2 stops
$652American Airlines
Sun, May 10 - Sat, May 16
Multiple Airlines Logo
12:20 pm - 11:46 pm
LGW
-
ONT
19h 26m
2 stops
Multiple Airlines Logo
2:08 pm - 8:40 am
ONT
-
LGW
34h 32m
2 stops
$683Multiple Airlines
Thu, Apr 16 - Thu, Apr 23
Iberia Logo
11:30 am - 11:46 pm
LGW
-
ONT
20h 16m
2 stops
Iberia Logo
2:08 pm - 8:00 pm
ONT
-
LGW
21h 52m
2 stops
$830Iberia
Mon, Apr 20 - Mon, May 4
Iberia Logo
9:50 am - 11:46 pm
LCY
-
ONT
21h 56m
2 stops
Iberia Logo
10:59 am - 3:15 pm
ONT
-
LCY
20h 16m
2 stops
$857Iberia
Sat, Apr 18 - Sat, Apr 25
Multiple Airlines Logo
1:25 pm - 11:46 pm
GLA
-
ONT
18h 21m
2 stops
Multiple Airlines Logo
2:08 pm - 3:35 pm
ONT
-
GLA
17h 27m
2 stops
$896Multiple Airlines
Booking Insights

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 flight to Ontario?

These are the best round-trip prices found by users searching on KAYAK in the last 72 hours.

In the last 3 days, the cheapest flight deal to Ontario was found on the route from London, at $601 return. The most popular connection is from Dallas to Ontario and KAYAK users have found round-trip deals for as low as $164 in the last 3 days.

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 September, where tickets cost $545 on average for return flights. On the other hand, the most expensive months are July and December, where the average cost of tickets from the United Kingdom is $854 and $814 respectively. For one-way flights, the best month to travel is May with an average price of $613.

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, which saves you about 47% compared to booking last minute. For the absolute cheapest price, our data suggests you should book 11 weeks before departure.

Find deals

Good to know

Low seasonJanuary
Cheapest flight$436
Best time to beat the crowds with an average 10% drop in price.
Most popular time to fly and prices are also 22% lower on average.
Flight from London Gatwick Airport to Ontario

FAQs - booking Ontario flights

  • What is the cheapest flight to Ontario?

    In the last 3 days, the cheapest flight deal to Ontario was found on the route from London, at $601 return. The most popular connection is from Dallas to Ontario and KAYAK users have found round-trip deals for as low as $164 in the last 3 days.

  • 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.

  • 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.

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

    Each week there are around 858 direct flights from within United Kingdom to Ontario. The most common day for departures is Friday, with 15% 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.

Reviews of the 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 9439 reviews
7.1Entertainment
8.1Crew
7.3Comfort
6.6Food
7.7Boarding
Airline reviews

Terrible experience! delay 2 time and say i dont have ticket

2.0 Mediocrephuong, Mar 2026
TPE - SFO
Read more United Airlines reviews

Terrible experience! delay 2 time and say i dont have ticket

It was amazing. I had several upgraded seats on my flight out. Everything went smooth with no delays.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Flight attendants were friendly & good service, food sucks, seats uncomfortable, not many Asian movies or shows flying from Hong Kong

Flight attendants had a little attitude. Food tastes no good.

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

Good flight. However, when booked flight with United, assumed the layover included by United in San Francisco of 1 hr and 40 minutes was sufficient . Not so and would recommend at least 2 hours or more. Needed to go through US immigration (very long lineups), then pick up bags, take all the way to another terminal, running because we did not have sufficient time. We made the flight because they held the door for us but luggage didn’t follow.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)