ONT

£372 Find Cheap Flights 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 28/10. 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
Travellers love KAYAK
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Everything you should know

Cheapest return fare
£470
Typical prices: £515-£409
Virgin Atlantic
Thu 5/11Sat 14/11
LHR - ONT • 1 stop
Cheapest one-way flight
£372
British Airways
Wed 28/10
LHR - ONT • 1 stop
When to book
in advance
Our data shows that travellers who book at least 2 weeks in advance save around 37% compared to booking last minute.
Insights
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Insights
When to travel
Cheapest • 18% price drop
Most popular
Good to know
Good to know
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KAYAK searches hundreds of sites at once to find you the best travel deals.
We hope you love your trip to Ontario!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights 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 return flight deals to Ontario

Thu, 5 Nov - Sat, 14 Nov
Virgin Atlantic Logo
10:45 - 16:12
LHR
-
ONT
13h 27m
1 stop
Virgin Atlantic Logo
13:00 - 10:00
ONT
-
LHR
13h 00m
1 stop
£470Virgin Atlantic
Sat, 3 Oct - Fri, 16 Oct
Virgin Atlantic Logo
10:55 - 23:44
LHR
-
ONT
20h 49m
1 stop
Virgin Atlantic Logo
07:00 - 13:15
ONT
-
LHR
22h 15m
1 stop
£471Virgin Atlantic
Mon, 5 Oct - Thu, 15 Oct
United Airlines Logo
07:30 - 20:16
LHR
-
ONT
20h 46m
2 stops
United Airlines Logo
05:00 - 07:15
ONT
-
LHR
18h 15m
2 stops
£484United Airlines
Tue, 1 Sep - Wed, 30 Sep
Iberia Logo
14:25 - 21:12
LHR
-
ONT
14h 47m
1 stop
Iberia Logo
14:22 - 12:50
ONT
-
LHR
14h 28m
1 stop
£494Iberia
Wed, 5 Aug - Thu, 13 Aug
Delta Logo
11:45 - 23:34
LHR
-
ONT
19h 49m
2 stops
Delta Logo
09:43 - 13:15
ONT
-
LHR
19h 32m
2 stops
£495Delta
Wed, 10 Jun - Tue, 30 Jun
Delta Logo
09:20 - 22:41
LCY
-
ONT
21h 21m
2 stops
Delta Logo
13:00 - 16:40
ONT
-
LCY
19h 40m
2 stops
£578Delta
Tue, 2 Jun - Tue, 23 Jun
British Airways Logo
08:35 - 22:38
GLA
-
ONT
22h 03m
2 stops
British Airways Logo
13:11 - 18:40
ONT
-
GLA
21h 29m
2 stops
£663British Airways
Wed, 2 Sep - Sun, 6 Sep
British Airways Logo
10:05 - 22:58
BHD
-
ONT
20h 53m
2 stops
British Airways Logo
23:59 - 18:45
ONT
-
BHD
34h 46m
2 stops
£669British Airways
Thu, 5 Nov - Thu, 26 Nov
Iberia Logo
07:50 - 22:23
LCY
-
ONT
22h 33m
2 stops
Iberia Logo
07:00 - 08:50
ONT
-
LCY
17h 50m
2 stops
£698Iberia
Tue, 22 Sep - Thu, 8 Oct
United Airlines Logo
06:05 - 18:19
MAN
-
ONT
20h 14m
2 stops
United Airlines Logo
13:18 - 17:20
ONT
-
MAN
20h 02m
2 stops
£701United Airlines
Booking Insights

KAYAK's insights & trends for flights to Ontario

Get data-powered insights and trends into 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 September, where tickets cost £403 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 £653 and £598 respectively. For one-way flights, the best month to travel is May with an average price of £451.

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.

Good to know - Cheap tickets to Ontario

Low seasonMay
Cheapest flight£372
Best time to beat the crowds but there is an average 12% increase in price.
Most popular time to fly (3% more expensive on average)
Flight from London Heathrow Airport to Ontario

When to book flights to Ontario

Are your dates flexible? Find out the best times to travel to Ontario based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated return price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. The information is for flights to Ontario based on your location. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs - booking Ontario flights

  • How far is Ontario Airport from central Ontario?

    Central Ontario is 3 miles away from Ontario Airport.

  • What is the name of Ontario’s airport?

    Ontario is served by Ontario Airport, also commonly referred to as Ontario or Ontario Intl. The airport code is ONT.

  • 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 travellers 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.

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 3 airlines flying 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 9695 reviews
7.7Boarding
7.1Entertainment
7.3Comfort
6.6Food
8.1Crew
Airline reviews

Seats were not super comfortable and food was not good at all. If I had a chance I would definitely fly a different airline. Of course they are better than any budget airline, but not by much.

6.0 GoodAnonymous, May 2026
KIX - SFO
Read more United Airlines reviews

Seats were not super comfortable and food was not good at all. If I had a chance I would definitely fly a different airline. Of course they are better than any budget airline, but not by much.

Flew steerage class. Short on leg room unless you pay more. No window unless you pay more. Etc. United is trying to squeeze every cent from you. It doesn’t make for any loyalty.

Outstanding service, efficient & friendly crew, flight was safe, comfortable & on time

Outstanding service, great food, friendly & efficient crew, safe & comfortable flight

Staff were not attentive, wifi did not work, cut my head in the bathroom due to the position of the soap on the sink, had blood running down my face, told staff, they had no expression no sympathy, didn't even say "sorry", they said "oh we will have a look at that" about 10 mins later the purser brought me a bandaid, still no sorry.... Shocking

The crew was great. Very friendly and responsive. The plane was old, small and tight. We ran out of overhead space and I had to check. Middle seat was particularly tight.

The flight was delayed from take off because only one runway was operational in San Francisco.

Several missed and almost missed connections. It felt like everything was being patched together last minute without enough resources and it ended up being an extremely stressful experience that basically ruined our weekend on the west coast. What a waste.

Dinner was good, but the breakfast served in the morning was horrible.

Packed in plane small uncomfortable seats elbow to elbow nobody wants to be in that situation for the money they paid

Seating and zone. The minor I went with didn’t even seat close to me

My seat 3G did not go down fully and the buttons were not working properly

Food has been disappointing in both legs of flight to india

Great staff great experience, made a 2 hour delay very bearable

Great staff, great experience, made a 2 hour delay very bearable

Food was the worst I’ve had on a VA flight. Normally it’s a lot better

I was my pleasure to fly virgin on my birthday for my first solo trip ever 🫶🏼

These are one of the older seat arrangements facing away from the windows! Not particularly convenient sets. No storage spaces. NO COAT HANGING HOOKS. Inconvenient business class seat compared to any other airlines of similar class. Staff are excellent! Extremely professional, friendly. Food is good too.

Overall, flight was excellent but check in was very slow for Premium Economy. Economy queue was shorter but we weren't allowed to use it.

The staff was not very polite but the flight was very very nice and comfortable and the entertainment was great

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 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.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario