ONT

£347 Find Cheap Flights to Ontario – Compare and Save

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Everything you should know

Cheapest return fare
£377
Typical prices: £473-£549
United Airlines
Wed 25/11Sun 6/12
LHR - ONT • 2 stops
Cheapest one-way flight
£347
Alaska Airlines
Fri 23/10
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

Wed, 25 Nov - Sun, 6 Dec
United Airlines Logo
09:00 - 20:02LHR  London Heathrow-ONT Ontario
19h 02m2 stops Zurich San Francisco
United Airlines Logo
07:00 - 05:55ONT  Ontario-LHR London Heathrow
14h 55m1 stop Chicago O'Hare Intl
£377United Airlines
Wed, 25 Nov - Sun, 6 Dec
United Airlines Logo
09:00 - 20:02LHR  London Heathrow-ONT Ontario
19h 02m2 stops Zurich San Francisco
United Airlines Logo
16:03 - 07:25ONT  Ontario-LHR London Heathrow
31h 22m1 stop San Francisco
£377United Airlines
Sat, 7 Nov - Sat, 5 Dec
United Airlines Logo
09:00 - 20:15LHR  London Heathrow-ONT Ontario
19h 15m2 stops Zurich San Francisco
United Airlines Logo
13:40 - 09:40ONT  Ontario-LHR London Heathrow
12h 00m1 stop Denver Intl
£378United Airlines
Wed, 4 Nov - Fri, 4 Dec
Virgin Atlantic Logo
08:40 - 22:43LHR  London Heathrow-ONT Ontario
46h 03m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
07:00 - 10:40ONT  Ontario-LHR London Heathrow
19h 40m1 stop Seattle/Tacoma Intl
£388Virgin Atlantic
Wed, 4 Nov - Fri, 4 Dec
Virgin Atlantic Logo
08:40 - 22:43LHR  London Heathrow-ONT Ontario
46h 03m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
13:11 - 07:05ONT  Ontario-LHR London Heathrow
57h 54m2 stops Salt Lake City Minneapolis St Paul
£388Virgin Atlantic
Wed, 25 Nov - Sun, 6 Dec
Virgin Atlantic Logo
12:20 - 23:00LHR  London Heathrow-ONT Ontario
18h 40m1 stop Seattle/Tacoma Intl
Virgin Atlantic Logo
07:05 - 09:00ONT  Ontario-LHR London Heathrow
17h 55m1 stop Atlanta Hartsfield-Jackson
£399Virgin Atlantic
Wed, 25 Nov - Sun, 6 Dec
Multiple Airlines Logo
12:20 - 23:00LHR  London Heathrow-ONT Ontario
18h 40m1 stop Seattle/Tacoma Intl
Multiple Airlines Logo
23:08 - 07:50ONT  Ontario-LHR London Heathrow
24h 42m1 stop Atlanta Hartsfield-Jackson
£405Multiple Airlines
Wed, 4 Nov - Fri, 4 Dec
Delta Logo
06:30 - 22:43LHR  London Heathrow-ONT Ontario
24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Delta Logo
06:00 - 07:45ONT  Ontario-LHR London Heathrow
17h 45m2 stops Salt Lake City Detroit Metropolitan Wayne County
£409Delta
Tue, 26 Jan - Sat, 30 Jan
British Airways Logo
14:45 - 23:17LHR  London Heathrow-ONT Ontario
16h 32m1 stop Dallas/Fort Worth
British Airways Logo
14:17 - 12:00ONT  Ontario-LHR London Heathrow
13h 43m1 stop Dallas/Fort Worth
£482British Airways
Fri, 25 Dec - Sat, 9 Jan
British Airways Logo
11:55 - 22:02MAN  Manchester-ONT Ontario
18h 07m2 stops London Heathrow Dallas/Fort Worth
British Airways Logo
12:44 - 16:25ONT  Ontario-MAN Manchester
19h 41m2 stops Dallas/Fort Worth London Heathrow
£541British 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

£347
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 8557 reviews
7.8Entertainment
8.1Boarding
8.5Crew
7.8Comfort
7.2Food
Airline reviews

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!

6.0 GoodFash, Sept 2026
Read more Delta reviews

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

We never made it on this flight because we missed our connection due to o delayed flight from Jackson.

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

My email and credit card were used fraudulently for this trip, so no, I did not take this flight.

Airplane is not very clean, food quality and taste was not good. Lufthansa used to be good but nowadays went down. Overall experience is just okay, wouldn't fly again, prefer Turkish airlines.

I did bought anything… I don’t understand how this book appears to me . Ridiculous

My flight from Honolulu (UA 1221) was on a very old 757, no video monitors anywhere. If you wanted to watch a movie, you needed to do so using the United app on one’s phone. WiFi was $8 for Mileage Plus members; I demurred, choosing to spend my time reading a novel using the Kindle app on my Samsung S26. The meal was okay … Breakfast on any domestic airline is so-so as a rule and this one was no exception. The best part of the meal was the fruit plate and the warm croissant. The highlight: The flight left on time and arrived early.

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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