$486 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 5/20. 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
Travelers love KAYAK
41,299,237 searches in the past 7 days on KAYAK

Save 24% or moreCompare multiple travel sites with one search.

Track pricesNot ready to book? Create a price alert for when prices drop.

Bundle and saveSave money when you bundle your flight + hotel.

Filter your dealsChoose cabin class, free Wi-Fi and more.

Flight Deals
Booking Insights
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, May 6 - Mon, May 11
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
$621British Airways
Mon, May 25 - Mon, Jun 1
American Airlines Logo
4:10 pm - 7:56 pm
LHR
-
ONT
35h 46m
2 stops
American Airlines Logo
10:00 pm - 6:50 am
ONT
-
LHR
24h 50m
2 stops
$634American Airlines
Tue, Sep 15 - Sat, Sep 19
Virgin Atlantic Logo
11:40 am - 11:44 pm
LHR
-
ONT
20h 04m
2 stops
Virgin Atlantic Logo
5:55 pm - 12:10 pm
ONT
-
LHR
34h 15m
1 stop
$635Virgin Atlantic
Wed, Sep 9 - Wed, Nov 18
British Airways Logo
2:25 pm - 9:08 pm
LHR
-
ONT
14h 43m
1 stop
British Airways Logo
4:47 pm - 1:15 pm
ONT
-
LHR
12h 28m
1 stop
$638British Airways
Thu, May 21 - Thu, May 28
Virgin Atlantic Logo
10:55 am - 11:34 pm
LHR
-
ONT
20h 39m
1 stop
Virgin Atlantic Logo
11:52 am - 3:35 pm
ONT
-
LHR
19h 43m
1 stop
$642Virgin Atlantic
Wed, Jul 22 - Wed, Jul 29
Virgin Atlantic Logo
10:55 am - 4:35 pm
LHR
-
ONT
13h 40m
1 stop
Virgin Atlantic Logo
11:48 am - 1:15 pm
ONT
-
LHR
17h 27m
1 stop
$644Virgin Atlantic
Tue, Sep 8 - Mon, Sep 21
Iberia Logo
11:30 am - 6:57 pm
LGW
-
ONT
39h 27m
2 stops
Iberia Logo
2:22 pm - 8:00 pm
ONT
-
LGW
45h 38m
2 stops
$704Iberia
Wed, Sep 9 - Wed, Sep 16
Delta Logo
9:20 am - 10:44 pm
LCY
-
ONT
21h 24m
2 stops
Delta Logo
1:00 pm - 4:40 pm
ONT
-
LCY
19h 40m
2 stops
$739Delta
Tue, Sep 8 - Sat, Sep 19
Iberia Logo
11:30 am - 9:08 pm
LGW
-
ONT
41h 38m
2 stops
Iberia Logo
7:20 am - 8:00 pm
ONT
-
LGW
28h 40m
2 stops
$744Iberia
Sat, Jun 6 - Sat, Jun 13
Delta Logo
10:25 am - 10:32 pm
LGW
-
ONT
20h 07m
2 stops
Delta Logo
6:20 am - 9:20 am
ONT
-
LGW
19h 00m
2 stops
$829Delta
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 $621 return. The most popular connection is from Seattle to Ontario and KAYAK users have found round-trip deals for as low as $142 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 $548 on average for return flights. On the other hand, the most expensive months are May and December, where the average cost of tickets from the United Kingdom is $902 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 37% 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$486
Best time to beat the crowds with an average 9% 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

  • 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 $621 return. The most popular connection is from Seattle to Ontario and KAYAK users have found round-trip deals for as low as $142 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 968 direct flights from within United Kingdom to Ontario. The most common day for departures is Sunday, with 17% 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.
6.7
British AirwaysOverall score based on 7906 reviews
6.9Boarding
7.7Crew
6.4Food
6.4Entertainment
6.8Comfort
Airline reviews

OK, except for a cabin attendant's lack of attention.

8.0 ExcellentHiroshi, Apr 2026
LHR - BOS
Read more British Airways reviews

OK, except for a cabin attendant's lack of attention.

efficient. on time. cabin crew were very professional and very nice to deal with. would definately fly BA again.

It was great overall. A few slight improvements could be made on the onboarding process at the Gates with announcements and clarity of communications (both at the gate and in flight). The movies in the entertainment options could be improved for bollywood, hollywood.

I alrady responded to this request, and expllaned at length that this was the worst flying experience in my 77 years. I will NEVER fly BA again.

Airbus A350 is poorly designed for wheelchair users and reduced mobility passengers. The angle of the pods makes it awkward to transfer. I was able to but I have ab stability. It could be a real challenge for people with more severe mobility impairments. You'd think Airbus would have come up with a solution for this or thought more about us disabled folks more when designing this aircraft.

The crew has always been great on BA. They are very friendly and accommodating. I like that they have vegetarian options already in the menu. And the free wine is a nice perk.) I noticed (both directions of my trip) minor upgrades/ replacements needed on the plane itself (touch screen didn't work with touch; bathroom light didn't go on). However, this is one of my favorite airlines.

Everything was spectacular except the boarding. It was just a mob of people while all groups were called over the public address system.

The Britts are wonderful to fly with and the crew were very hospitable. Again, I really wish they had been able to retrieve my carryon bag from baggage claim before the flight so I could be in a less worrisome state of mind, but that's not on them. I completely understand. The window seats with the dimmable windows were very cool!

There was a delay for the San Francisco-London flight, but we were all informed via text and email. The staff was very friendly and nice and the food was good. I do recommend that the airline offer something without eggs or something vegan for the vegetarian meal option. A lot of Indians are lacto-vegetarian, while some could be allergic to eggs/dairy.

food options were terrible. for a 10-hour flight, there should be 2 decent meals. Also, flight attendants should come around with drinks more than just at the meals.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)