ONT

£348 Find Cheap Flights to Ontario – Compare and Save

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Everything you should know

Cheapest return fare
£377
Typical prices: £464-£534
United Airlines
Mon 19/10Mon 26/10
LHR - ONT • 2 stops
Cheapest one-way flight
£348
Alaska Airlines
Tue 12/1
LHR - ONT • 1 stop
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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, 19 Oct - Mon, 26 Oct
United Airlines Logo
08:40 - 17:41LHR  London Heathrow-ONT Ontario
41h 01m2 stops Zurich San Francisco
United Airlines Logo
05:00 - 09:40ONT  Ontario-LHR London Heathrow
21h 40m1 stop Denver Intl
£377United Airlines
Thu, 22 Oct - Thu, 29 Oct
United Airlines Logo
06:55 - 22:49LHR  London Heathrow-ONT Ontario
23h 54m2 stops Munich Franz Josef Strauss Chicago O'Hare Intl
United Airlines Logo
05:00 - 09:40ONT  Ontario-LHR London Heathrow
21h 40m1 stop Denver Intl
£380United Airlines
Mon, 19 Oct - Mon, 26 Oct
United Airlines Logo
06:55 - 10:23LHR  London Heathrow-ONT Ontario
35h 28m2 stops Munich Franz Josef Strauss San Francisco
United Airlines Logo
09:25 - 07:25ONT  Ontario-LHR London Heathrow
15h 00m1 stop San Francisco
£380United Airlines
Wed, 4 Nov - Fri, 4 Dec
Virgin Atlantic Logo
11:45 - 22:43LHR  London Heathrow-ONT Ontario
42h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
12:20 - 07:50ONT  Ontario-LHR London Heathrow
35h 30m1 stop Atlanta Hartsfield-Jackson
£388Virgin Atlantic
Wed, 4 Nov - Fri, 4 Dec
Virgin Atlantic Logo
15:45 - 22:43LHR  London Heathrow-ONT Ontario
38h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
06:00 - 07:05ONT  Ontario-LHR London Heathrow
17h 05m2 stops Salt Lake City Minneapolis St Paul
£388Virgin Atlantic
Mon, 5 Oct - Mon, 12 Oct
Virgin Atlantic Logo
14:45 - 23:55LHR  London Heathrow-ONT Ontario
41h 10m2 stops Amsterdam Schiphol Salt Lake City
Virgin Atlantic Logo
09:45 - 10:00ONT  Ontario-LHR London Heathrow
16h 15m1 stop Salt Lake City
£388Virgin Atlantic
Mon, 19 Oct - Mon, 26 Oct
Delta Logo
11:45 - 22:43LHR  London Heathrow-ONT Ontario
18h 58m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Delta Logo
06:00 - 09:00ONT  Ontario-LHR London Heathrow
20h 00m2 stops Salt Lake City Atlanta Hartsfield-Jackson
£409Delta
Thu, 21 Jan - Mon, 25 Jan
Air Canada Logo
14:30 - 09:47LHR  London Heathrow-ONT Ontario
27h 17m2 stops Vancouver Intl San Francisco
Air Canada Logo
05:00 - 07:10ONT  Ontario-LHR London Heathrow
18h 10m2 stops Denver Intl Montreal Pierre Elliott Trudeau Intl
£414Air Canada
Sun, 13 Dec - Sun, 17 Jan
British Airways Logo
14:35 - 21:53LHR  London Heathrow-ONT Ontario
15h 18m1 stop Phoenix Sky Harbor Intl
British Airways Logo
16:25 - 13:35ONT  Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
£475British Airways
Mon, 11 Jan - Mon, 18 Jan
British Airways Logo
14:35 - 21:59LHR  London Heathrow-ONT Ontario
15h 24m1 stop Phoenix Sky Harbor Intl
British Airways Logo
16:25 - 13:35ONT  Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
£482British 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 £377 return. The most popular connection is from London to Ontario, while KAYAK users have found return deals for as low as £377 in the last 5 days.

Good to know - Cheap tickets to Ontario

Low season

May

Cheapest flight

£348
Best time to beat the crowds (2% less expensive on average)
Most popular time to fly and prices are also 5% lower 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 £377 return. The most popular connection is from London to Ontario, while KAYAK users have found return deals for as low as £377 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 4 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.
7.8
DeltaOverall score based on 8553 reviews
7.8Comfort
8.1Boarding
8.5Crew
7.8Entertainment
7.2Food
Airline reviews

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.

2.0 MediocreDerek, Sept 2026
Read more Delta reviews

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.

Both of my flights to and from JFK experienced significant delays. Most notably, my first flight was delayed by six hours due to crew members being affected by delays on a previous flight. While I understand that disruptions can occur, Delta’s staffing and operational planning should include sufficient contingency measures to handle situations like this rather than placing the full burden of those delays on customers. Additionally, the $12 meal voucher offered as compensation was inadequate, particularly given the high cost of food and beverages at the airport. Considering the length of the delay and the substantial inconvenience caused, I believe more meaningful compensation would have been appropriate.

Comfortable seats. Nice service online. Short flight, so not a lot of time to enjoy.

The flight was done by SkyWest only WIFI no entertainment center are available on the CRJ

Delta is always late. Ruined our first day of a short vacation. Timing is important. We pay to stay on an itinerary

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

Boarding, time to take off, in flight offerings, and staff were all great. I recommend using UA for this short flight.

Good experience. Staff was friendly and helpful. Flight was slightly delayed due to airport construction, but they still arrived on time.

This is the worst airline I’ve ever been on in my life and I’ve been probably on 75% of them. I said 15 years ago I would never go on United again. I was an idiot. I booked a flight with them from Las Vegas to San Francisco and of course they screwed that up and cost me a day flying all over the world trying to get to Thailand. My luggage was gone for 35 hours all because they couldn’t make their route on time

The flight out of Fresno boarded 1.5 hour past scheduled and made me miss my connecting flight from SFO to SEA.

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.

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.

Crew were nice, food was good. Boarding was horrendous. We were driven around the airport in a bus forced to climb a long flight of very steep stairs with no adequate handrails to board the plane . In many many years of flying to the US I have never been required to do this . There was no assistance for those needing help getting up the stairs to the plane. A fellow passenger helped me. No idea how other elderly, physically limited passengers or those with young children managed . It was a full flight with crowds trying to get up the stairs. It was an accident waiting to happen.

Horrible, the plane is just old and junky...Filthy restroom, seat was as hard as rock. The food, mystery side dish, inedible..geez..just Horrible. Never flying BA again

the service on Business class should be improved to be at par with industry leaders like Cathay Pacific and Singapore AIrlines. A lot of room for improvement.

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