ONT

£349 Find Cheap Flights to Ontario – Compare and Save

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Everything you should know

Cheapest return fare
£376
Typical prices: £484-£540
United Airlines
Mon 9/11Mon 16/11
LHR - ONT • 2 stops
Cheapest one-way flight
£333
Alaska Airlines
Mon 1/2
LHR - ONT • 1 stop
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We hope you love your trip to Ontario!
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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

Mon, 9 Nov - Mon, 16 Nov
United Airlines Logo
09:00 - 20:15LHR  London Heathrow-ONT Ontario
19h 15m2 stops Zurich San Francisco
United Airlines Logo
18:37 - 21:20ONT  Ontario-LHR London Heathrow
18h 43m2 stops San Francisco Newark
£376United Airlines
Thu, 3 Dec - Wed, 9 Dec
United Airlines Logo
09:00 - 20:38LHR  London Heathrow-ONT Ontario
19h 38m2 stops Zurich San Francisco
United Airlines Logo
05:00 - 09:40ONT  Ontario-LHR London Heathrow
20h 40m1 stop Denver Intl
£376United Airlines
Tue, 1 Dec - Tue, 8 Dec
Air Canada Logo
18:00 - 21:11LHR  London Heathrow-ONT Ontario
35h 11m2 stops Toronto Pearson Intl Denver Intl
Air Canada Logo
13:40 - 08:30ONT  Ontario-LHR London Heathrow
34h 50m2 stops Denver Intl Toronto Pearson Intl
£391Air Canada
Thu, 15 Oct - Sun, 18 Oct
Air Canada Logo
15:00 - 22:51LHR  London Heathrow-ONT Ontario
39h 51m2 stops Vancouver Intl San Francisco
Air Canada Logo
06:07 - 13:20ONT  Ontario-LHR London Heathrow
23h 13m2 stops San Francisco Vancouver Intl
£395Air Canada
Wed, 4 Nov - Sun, 8 Nov
Virgin Atlantic Logo
12:20 - 22:43LHR  London Heathrow-ONT Ontario
18h 23m1 stop Seattle/Tacoma Intl
Virgin Atlantic Logo
07:07 - 07:50ONT  Ontario-LHR London Heathrow
16h 43m1 stop Atlanta Hartsfield-Jackson
£403Virgin Atlantic
Mon, 9 Nov - Mon, 16 Nov
Virgin Atlantic Logo
12:20 - 23:00LHR  London Heathrow-ONT Ontario
18h 40m1 stop Seattle/Tacoma Intl
Virgin Atlantic Logo
07:05 - 06:25ONT  Ontario-LHR London Heathrow
15h 20m1 stop Atlanta Hartsfield-Jackson
£403Virgin Atlantic
Mon, 19 Oct - Mon, 26 Oct
Alaska Airlines Logo
17:00 - 23:42LHR  London Heathrow-ONT Ontario
14h 42m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
14:13 - 12:20ONT  Ontario-LHR London Heathrow
15h 07m1 stop Seattle/Tacoma Intl
£421Alaska Airlines
Mon, 23 Nov - Mon, 7 Dec
Alaska Airlines Logo
14:45 - 23:31LHR  London Heathrow-ONT Ontario
16h 46m1 stop Seattle/Tacoma Intl
Alaska Airlines Logo
17:01 - 12:20ONT  Ontario-LHR London Heathrow
35h 19m1 stop Seattle/Tacoma Intl
£423Alaska Airlines
Sun, 13 Dec - Sun, 7 Mar
British Airways Logo
14:35 - 21:53LHR  London Heathrow-ONT Ontario
15h 18m1 stop Phoenix Sky Harbor Intl
British Airways Logo
17:02 - 13:35ONT  Ontario-LHR London Heathrow
12h 33m1 stop Phoenix Sky Harbor Intl
£477British Airways
Sat, 31 Oct - Mon, 9 Nov
British Airways Logo
10:05 - 18:44LHR  London Heathrow-ONT Ontario
15h 39m1 stop Dallas/Fort Worth
British Airways Logo
16:51 - 13:35ONT  Ontario-LHR London Heathrow
12h 44m1 stop Phoenix Sky Harbor Intl
£477British 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 £376 return. The most popular connection is from London to Ontario, while KAYAK users have found return deals for as low as £376 in the last 5 days.

Good to know - Cheap tickets to Ontario

Low season

May

Cheapest flight

£349
Best time to beat the crowds (1% less expensive on average)
Most popular time to fly (1% 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

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 £376 return. The most popular connection is from London to Ontario, while KAYAK users have found return deals for as low as £376 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 12985 reviews
7.0Entertainment
7.0Food
7.8Comfort
8.1Boarding
8.5Crew
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.

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

My seat was changed without my consent. It wasn’t a major deal but annoying.

Flew in first class. It received service and attention that would be considered poor even by economy standards.

The Airline Attendant found us in flight and moved us to seats in the front of economy due to the short time we would have to make our connecting flight. We really appreciated it.

DL486 could not get to the gate due to jet bridge malfunction. We moved gates. The connecting flight of LAX to MCO was not communicated with. Even though we were in the same terminal, DL482 left without about 10 of us, including a mother and her 3 children. I got to the gate at 7:34 am which is past the 7:20 am last call for a 7:35 am departure. Had they waited 5 minutes, all of us would have made it on board.

Delta has joint the nickel and diming airlines. The experience is getting worst by the day. 1,000,000 miles for a trip to Asia in Business Class where I got the same thing for just under 90,000 miles through an Asian airline. Where is Richard Anderson? Please come back!

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.

Very bad multiple confusion and miscommunication which i ended up missing my flight.

The experience was bad. Flight was delayed to handle maintenance (understandable) but still there was some dew forming and dropping as droplets on few seats. Internet at best was allowing some browsing but at a snail pace.

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

The food was horrible. There was no. Wifi, and it was just terrible from bangkok to d. C

My flight got cancelled. Couldn’t get my luggage. It arrived at my destination ahead of me. I didn’t get my preordered meal. Had to spend the night in the airport.

United did nit provide any updated on flight crew not bein available until boarding time started. It was bad. Itws alate night flight and there no proactive communication and iha d an important meeting that i missed due to thus

Delayed too much. 1.5 hrs in the airport and another 1 hr in the runway. Got too late in the night. There was no proper food available.

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.

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.

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

Los Angeles to London. 25th of April 2026. Business class. I was flying backwards with a complete stranger snoring next to me. In Business class. Males and females, strangers lying next to each other. Seats were backwards. I paid for comfort. I got dizziness and stress.

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.

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.

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