$506 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.
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

Mon, Jun 1 - Mon, Jun 15
Iberia Logo
2:25 pm - 11:59 pm
LHR
-
ONT
17h 34m
1 stop
Iberia Logo
12:41 pm - 12:50 pm
ONT
-
LHR
16h 09m
1 stop
$599Iberia
Wed, Jun 10 - Mon, Jun 15
British Airways Logo
4:25 pm - 11:59 pm
LHR
-
ONT
15h 34m
1 stop
British Airways Logo
12:41 pm - 12:50 pm
ONT
-
LHR
16h 09m
1 stop
$625British Airways
Fri, Nov 6 - Sat, Nov 21
Virgin Atlantic Logo
12:20 pm - 10:43 pm
LHR
-
ONT
18h 23m
1 stop
Virgin Atlantic Logo
6:00 am - 10:00 am
ONT
-
LHR
20h 00m
1 stop
$638Virgin Atlantic
Wed, Aug 5 - Thu, Aug 13
Multiple Airlines Logo
9:20 am - 10:42 am
LHR
-
ONT
33h 22m
1 stop
Multiple Airlines Logo
6:01 pm - 3:35 pm
ONT
-
LHR
13h 34m
1 stop
$641Multiple Airlines
Mon, Jun 1 - Mon, Jun 15
Virgin Atlantic Logo
8:40 am - 10:32 pm
LHR
-
ONT
21h 52m
2 stops
Virgin Atlantic Logo
6:20 am - 3:35 pm
ONT
-
LHR
25h 15m
1 stop
$648Virgin Atlantic
Wed, Jul 15 - Wed, Jul 29
American Airlines Logo
8:55 am - 7:59 pm
LHR
-
ONT
19h 04m
1 stop
American Airlines Logo
10:25 am - 9:00 am
ONT
-
LHR
14h 35m
1 stop
$659American Airlines
Mon, Oct 12 - Wed, Oct 21
Delta Logo
6:30 am - 4:12 pm
LHR
-
ONT
17h 42m
2 stops
Delta Logo
12:00 pm - 12:05 pm
ONT
-
LHR
16h 05m
2 stops
$662Delta
Tue, Oct 13 - Sat, Oct 24
Delta Logo
10:35 am - 6:18 pm
LGW
-
ONT
39h 43m
2 stops
Delta Logo
7:00 am - 10:00 am
ONT
-
LGW
19h 00m
2 stops
$683Delta
Tue, Aug 4 - Sun, Aug 9
American Airlines Logo
4:05 pm - 6:15 pm
MAN
-
ONT
34h 10m
2 stops
American Airlines Logo
8:01 pm - 7:15 pm
ONT
-
MAN
39h 14m
2 stops
$892American Airlines
Sun, Sep 20 - Sun, Oct 4
Multiple Airlines Logo
5:40 am - 4:14 pm
EDI
-
ONT
18h 34m
2 stops
Multiple Airlines Logo
10:59 pm - 11:50 am
ONT
-
EDI
28h 51m
1 stop
$977Multiple 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 $599 return. The most popular connection is from Seattle to Ontario and KAYAK users have found round-trip deals for as low as $163 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 $547 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 $888 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 38% 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$506
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly with an average 4% increase in price.
Flight from London Heathrow 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 $599 return. The most popular connection is from Seattle to Ontario and KAYAK users have found round-trip deals for as low as $163 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 1,282 direct flights from within United Kingdom to Ontario. The most common day for departures is Sunday, with 18% 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 7986 reviews
6.8Comfort
7.7Crew
6.4Food
6.4Entertainment
6.9Boarding
Airline reviews

Long line with check in at the DIA British Airway counter.

8.0 ExcellentAudrey, May 2026
LHR - DEN
Read more British Airways reviews

Long line with check in at the DIA British Airway counter.

The flights were on time. Cabin crew were nice. The food was terrible! Checking in was not easy using my phone.

Crew were fantastic and the aircraft was extremely comfortable, but outdated. Headphone jacks were worn out and sound normally only came out of one ear unless positioned just right.

A shout-out to the flight attendent, Lauren, who was the main person assisting me. She was amazing - perfect balance of bright, cheerful, engaging, yet formal

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 you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)