ONT

£348 Find Cheap Flights to Ontario – Compare and Save

1 adult
1 adult, Economy, 0 bags

Save 34% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Everything you should know

Cheapest return fare
£413
Typical prices: £557-£625
Alaska Airlines
Tue 8/12Wed 23/12
LHR - ONT • 1 stop
Cheapest one-way flight
£348
Multiple Airlines
Sun 6/12
LGW - ONT • 3 stops
Top routes
Insights
Insights
Insights
Insights
Start a new search
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

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent return flight deals to Ontario

Tue, 8 Dec - Wed, 23 Dec
Alaska Airlines Logo
14:45 - 16:05LHR  London Heathrow-ONT Ontario
33h 20m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
20:59 - 12:20ONT  Ontario-LHR London Heathrow
31h 21m1 stop Seattle/Tacoma Intl
£413Alaska Airlines
Thu, 3 Dec - Thu, 10 Dec
Alaska Airlines Logo
14:45 - 22:59LHR  London Heathrow-ONT Ontario
16h 14m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
11:57 - 12:20ONT  Ontario-LHR London Heathrow
16h 23m1 stop Seattle/Tacoma Intl
£413Alaska Airlines
Thu, 24 Dec - Sat, 23 Jan
United Airlines Logo
13:35 - 22:31LHR  London Heathrow-ONT Ontario
16h 56m1 stop Chicago O'Hare Intl
United Airlines Logo
09:45 - 11:15ONT  Ontario-LHR London Heathrow
17h 30m1 stop San Francisco
£469United Airlines
Fri, 25 Dec - Mon, 18 Jan
United Airlines Logo
12:05 - 22:11LHR  London Heathrow-ONT Ontario
18h 06m1 stop Houston George Bush Intcntl
United Airlines Logo
07:00 - 05:55ONT  Ontario-LHR London Heathrow
14h 55m1 stop Chicago O'Hare Intl
£469United Airlines
Mon, 23 Nov - Sun, 6 Dec
Multiple Airlines Logo
20:55 - 23:31GLA  Glasgow Intl-ONT Ontario
34h 36m2 stops London Gatwick Seattle/Tacoma Intl
Multiple Airlines Logo
06:00 - 08:25ONT  Ontario-GLA Glasgow Intl
42h 25m2 stops Seattle/Tacoma Intl London Heathrow
£530Multiple Airlines
Thu, 11 Mar - Mon, 22 Mar
Virgin Atlantic Logo
20:25 - 22:43LHR  London Heathrow-ONT Ontario
34h 18m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
11:55 - 10:40ONT  Ontario-LHR London Heathrow
15h 45m1 stop Seattle/Tacoma Intl
£534Virgin Atlantic
Fri, 22 Jan - Fri, 29 Jan
Virgin Atlantic Logo
06:30 - 22:35LHR  London Heathrow-ONT Ontario
24h 05m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
13:20 - 10:00ONT  Ontario-LHR London Heathrow
12h 40m1 stop Salt Lake City
£535Virgin Atlantic
Sat, 30 Jan - Mon, 22 Feb
Delta Logo
06:30 - 21:43LHR  London Heathrow-ONT Ontario
23h 13m2 stops Amsterdam Schiphol Atlanta Hartsfield-Jackson
Delta Logo
07:05 - 11:40ONT  Ontario-LHR London Heathrow
20h 35m1 stop Atlanta Hartsfield-Jackson
£550Delta
Thu, 24 Dec - Thu, 31 Dec
British Airways Logo
13:50 - 23:59LHR  London Heathrow-ONT Ontario
18h 09m1 stop Dallas/Fort Worth
British Airways Logo
12:51 - 10:25ONT  Ontario-LHR London Heathrow
13h 34m1 stop Dallas/Fort Worth
£620British Airways
Sat, 12 Dec - Fri, 1 Jan
British Airways Logo
13:50 - 22:58LHR  London Heathrow-ONT Ontario
17h 08m1 stop Dallas/Fort Worth
British Airways Logo
14:22 - 12:10ONT  Ontario-LHR London Heathrow
13h 48m1 stop Dallas/Fort Worth
£644British Airways
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 flight to Ontario?

In the last 5 days, the cheapest flight deal to Ontario was found on the route from London, at £413 return. The most popular connection is from London to Ontario, while KAYAK users have found return deals for as low as £413 in the last 5 days.

Good to know - Cheap tickets to Ontario

Low season

May

Cheapest flight

£348
Best time to beat the crowds (1% less expensive on average)
Most popular time to fly and prices are also 5% lower on average.
Flight from London Gatwick 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

FAQs - booking Ontario flights

  • What is the cheapest flight to Ontario?

    In the last 5 days, the cheapest flight deal to Ontario was found on the route from London, at £413 return. The most popular connection is from London to Ontario, while KAYAK users have found return deals for as low as £413 in the last 5 days.

  • 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 5 airlines flying to Ontario

 
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.
7.9
Alaska AirlinesOverall score based on 13159 reviews
8.5Crew
7.0Food
7.8Comfort
7.0Entertainment
8.1Boarding
Airline reviews

Didn’t call First Class passengers, called priority boarding. I’m old, I was listening for First Class. Family in row 3 made the flight annoying. Out of control child, father the kept getting into to overhead slamming it shut, blocked the isle for a solid 45 seconds during de boarding. Then blocked the door getting off the aircraft. These people should seriously be fined for their behavior, I didn’t splurge on First Class tickets to deal with such things.

6.0 GoodAnonymous, Sept 2026
Read more Alaska Airlines reviews

Didn’t call First Class passengers, called priority boarding. I’m old, I was listening for First Class. Family in row 3 made the flight annoying. Out of control child, father the kept getting into to overhead slamming it shut, blocked the isle for a solid 45 seconds during de boarding. Then blocked the door getting off the aircraft. These people should seriously be fined for their behavior, I didn’t splurge on First Class tickets to deal with such things.

I love the service! I was hoping they would keep the Ontario to Santa Rosa route.

The food selections were not good, and entertainment was non existent.

Staff inside Portland terminal were rude, made us fell rushed and not at all accommodating to seniors. For this alone I will probably never booked from them again.

Loved the staff ease of flying snacks and free movies and WiFi

Flight was very warm. It felt like there was no working AC.

Delayed. It's not our first flight with them either, it's actually our 3rd and all 3 were delayed by hours each time. It was a myriad of delays. On one flight we boarded after being delayed for a little over an hr, only to be told we were going to sit in the plane for another hour before departing. Once landed, we waited another 40ish min to get to our gate. On another flight, flight was delayed just under 3 hrs but atleast we got to wait it out at the airport terminal. Its just a bad experience overall flying with Alaska Airlines.

Flight last minute delayed 2 hours for crew calling out sick

Alaska Airlines needs more bag tag kiosks and bag check-in stations in Seattle. A single entry point for the bag tag kiosks would be helpful. This alleviates lines forming at each individual kiosk, which causes traffic jams for people passing through.

Probably one of the best flights I’ve had! From entering the airport, to boarding to landing.

dropped my bags at Seattle Delta curbside. 1.5 hours before departure. one bag oversized made it. the other was left at curb and mishandled. poor communication from delta in sjc baggage claim. No internet on flight and food choices in business are horrible. You are forcing us to fly Alaska which is shockingly better than the Delta experience. that is a low bar.

attendents were rude and the boarding was disjointed and poor

There was an incredibly surly flight attendant that ruined the experience

After boarding the plane had to wait an hour at the for the copilot to show up before we could depart

The cabin and bathroom experience was poor as the cabin and bathroom were dirty and showed signs of an older plane that had not been updated for Customer’s, comfort and health. There was gum on my seat when I arrived and dirt spots around the fan and light controls. The flight was almost entirely full, so there was no way I could be moved from my seat. Th bathroom had the peeling paint.

Great crew. Comfortable seating. Nice overhead bin space. My app didn't allow me to check in for my flight to BOS. When I called Support, they didn't fix it, but just told me to check in at the airport. Seat back entertainment was great. Could be better if the audio could connect to Bluetooth.

I'm 6' 2" and even in economy plenty of leg room

great! appreciated the last minute upgrade to Comfort+ exit row, as well

Crew and support were very good; lounge was very good. Seat was narrow and very close to other passengers; lie flat is more complicated and exposed to the aisleways.

Space and comfort was good. Staff could have been more helpful and friendly.

Lounge was top notch h with great variety of food and drinks. Cabin crew were great. Smooth flight.

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

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

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

Unfortunately delayed 2 hrs due to faulty tyre.. which had to be changed, but better safe than sorry.

Security area in terminal 3 needs to be made much nicer. Less claustrophobic and use of glass and big ceilings wouldhelp

accomodating check in staff, friendly flight crew ( a crew member was speaking tactlessly and was overfamiliar with passengers

Seats need to be updated. Allowance needs to be made for dinner service at an alternative time

If I could fly Virgin Atlantic airlines to every place, I need to go, I would. Leaving Heathrow through the special virgin air entrance, security is completely white glove service. I love this airline. From ticketing agents to flight staff everyone tries to make it a wonderful & happy flight experience. I wish other airlines copied the positive culture of Virgin Airlines.

Starlink internet made the flight time shrink and I was able to work.

The plane was so old. I paid a ridiculous amount to fly business and there was no internet for six hours! This can't be happening in 2026 and especially in cross country flights where there are a high volume of business travelers.

The food could have been better and the entertainment could have better movies or streaming.

Connection times always good online, but not in reality when first leg is delayed (2 out of 2 times this trip).

The flight was excellent. Their was no service as we boarded, the flight attendants spent about 30 minutes just taking and not really caring that the cabin was about 80 degrees and did not offered any beverage to first class passengers or any passenger. The flight from DEN to ONT is not long but not under an hour, we received one drink and bag of chips if you were lucky. I was in first class…. I did leave my hat on the plane and it only took less than five minutes for a United rep to locate and bring it to me.

The flight attendants were very rude, beyond comprehension. I took a business class from London to SFO for the first time on United. When I asked for a second piece of bread during dinner, the serving attendant threw a 3rd bread on my plate and said, “here. You can have this one too”! I couldn’t believe the rudeness of the attendant. Most all attendants were very rude, unhelpful, sing the food was absolutely disgusting. Never fly United internationally in business class. My flight back to SFO was a nightmare!!

Our experience on United Airlines was extremely poor. The plane was extremely cold throughout our entire flight- which multiple people complained about- and we had to wait 2 hours to get a blanket which was too thin and barely helped warm us up. As well as this, none of the entertainment features were working so we had to sit through a roughly 10 hour flight with nothing to keep our attention, including the actual flight path screen. It was an extremely disappointing experience and I would hope that this gets fixed if we ever choose United Airlines again.

The senior flight attendants were amazing. Totally different vibe from other carriers. Easy 10 hour flight in Business Class. Great food. Good humor as well.

Airline did not explain reasons why flight was delayed two hours. Explanations were badly needed and rarely provided. Problem seemed to clearly be the airline’s fault and not the fault of the weather or airport.

Liked Seat space in Premium Plus Disliked delay, poor management of boarding groups, missed meal at landing.

Terrible we had to wait out in the cold for transfer bus to take us to the plane. Once we finally got on the plane seat had no cushioning not comfortable at all. Food was overcooked and dried out. I was skipped over when they served drinks I had to call them back to give me a drink with my food. Overall terrible experience this time. I have used BA before and never experienced service like this before. If this keeps up I will look for other options

My experience on this flight was good. The seat I had had a lot of leg room, but it was so close to the aisle that the flight attendants kept bumping into my visual monitor connected to my seat to watch tv.

We never made this flight due to the flight from Barcelona being delayed, which I have reviewed in a separate review. But I can tell you that the Delta Airlines flight that did get us home, I am extremely happy with them and their crew. The only one person that I would praise within the entire part of BA is the girl I spoke to in the call center in India. Who completely understood, was dedicated to a resolution and was a complete realist in the situation. Unlike some of the people who don’t care about the human element and stick you on a flight whenever. She got us home.

You're asking 2 different questions. The flight from Los Angeles to London (and from London to Faro) was on British Airways. Those flights were awful. The app didn't provide detailed information, the WiFi that I paid for didn't work, the form I had to fill out to re-enter the UK was not communicated clearly so I nearly missed my flight. British Airways is significantly behind every other airline I've traveled in every way. American Airlines flight form London to Los Angeles was great. In the future, I will avoid flying British Airways when I can.

Our section of the aircraft in premium economy was very cold. We asked the attendants twice to raise the heat but it never happened. Even with the blanket it was chilly for 10 1/2 hours

It makes no sense for several types of drinks to already be out of stock in the middle of the flight.

Incredible. The upgrade to Business was a phenomenal way to end my trip, beyond grateful for the generosity and hospitality.

I was sent an email that said my card payment was not verified. When I spoke to an agent , he said my card was not verified and the flight I thought I had to booked was no longer available so I booked another flight on another airline(United). Later I got flight updates , etc., concerning my supposed first flight. So if I was charged for this flight on British Airways/American airlines, I need a refund.

Generally very good. I think their service is better than some other big names I used to travel with. Their food variety is second to none - and you can place order beforehand. Their seating design is a bit awkward for service, I'd say. Flight attendants must be tall enough - long legs and arms - to reach the window seat passenger while crossing over the isle passenger. Also appreciated the variety on entertainment.

Lovely big plane. Excellent take off and landing. Cabin crew were so nice. Flight in time no delays

More options for your flight to Ontario