ONT

£322 Find Cheap Flights to Ontario – Compare and Save

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Everything you should know

Cheapest return fare
£377
Typical prices: £472-£547
United Airlines
Sat 7/11Mon 30/11
LHR - ONT • 2 stops
Cheapest one-way flight
£322
Multiple Airlines
Mon 19/10
LGW - ONT • 3 stops
Top routes
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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

Sat, 7 Nov - Mon, 30 Nov
United Airlines Logo
09:00 - 20:15LHR  London Heathrow-ONT Ontario
19h 15m2 stops Zurich San Francisco
United Airlines Logo
06:00 - 07:25ONT  Ontario-LHR London Heathrow
17h 25m1 stop San Francisco
£377United Airlines
Fri, 16 Oct - Sat, 31 Oct
United Airlines Logo
08:40 - 22:51LHR  London Heathrow-ONT Ontario
22h 11m2 stops Zurich San Francisco
United Airlines Logo
05:00 - 09:40ONT  Ontario-LHR London Heathrow
21h 40m1 stop Denver Intl
£377United Airlines
Tue, 1 Dec - Sun, 6 Dec
United Airlines Logo
09:00 - 20:29LHR  London Heathrow-ONT Ontario
19h 29m2 stops Zurich San Francisco
United Airlines Logo
11:26 - 11:15ONT  Ontario-LHR London Heathrow
15h 49m1 stop San Francisco
£378United Airlines
Wed, 7 Oct - Thu, 5 Nov
Virgin Atlantic Logo
11:45 - 23:55LHR  London Heathrow-ONT Ontario
20h 10m2 stops Amsterdam Schiphol Salt Lake City
Virgin Atlantic Logo
06:20 - 06:50ONT  Ontario-LHR London Heathrow
40h 30m2 stops Seattle/Tacoma Intl Boston Logan Intl
£395Virgin Atlantic
Fri, 23 Oct - Sat, 31 Oct
Virgin Atlantic Logo
06:30 - 22:43LHR  London Heathrow-ONT Ontario
24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
06:00 - 07:05ONT  Ontario-LHR London Heathrow
18h 05m2 stops Salt Lake City Minneapolis St Paul
£399Virgin Atlantic
Sun, 11 Oct - Sun, 18 Oct
Air Canada Logo
15:05 - 17:36LHR  London Heathrow-ONT Ontario
34h 31m2 stops Vancouver Intl San Francisco
Air Canada Logo
05:00 - 11:50ONT  Ontario-LHR London Heathrow
22h 50m2 stops Denver Intl Toronto Pearson Intl
£399Air Canada
Fri, 23 Oct - Sat, 31 Oct
Virgin Atlantic Logo
06:30 - 22:43LHR  London Heathrow-ONT Ontario
24h 13m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
Virgin Atlantic Logo
06:00 - 10:00ONT  Ontario-LHR London Heathrow
21h 00m1 stop Salt Lake City
£402Virgin Atlantic
Thu, 24 Sep - Wed, 30 Sep
Air Canada Logo
15:00 - 22:59LHR  London Heathrow-ONT Ontario
39h 59m2 stops Vancouver Intl San Francisco
Air Canada Logo
13:52 - 06:35ONT  Ontario-LHR London Heathrow
32h 43m2 stops San Francisco Toronto Pearson Intl
£402Air Canada
Sat, 21 Nov - Sat, 5 Dec
British Airways Logo
14:45 - 22:36LHR  London Heathrow-ONT Ontario
15h 51m1 stop Dallas/Fort Worth
British Airways Logo
12:42 - 10:00ONT  Ontario-LHR London Heathrow
13h 18m1 stop Dallas/Fort Worth
£478British Airways
Fri, 30 Oct - Mon, 9 Nov
British Airways Logo
10:05 - 18:44LHR  London Heathrow-ONT Ontario
15h 39m1 stop Dallas/Fort Worth
British Airways Logo
12:42 - 10:00ONT  Ontario-LHR London Heathrow
13h 18m1 stop Dallas/Fort Worth
£478British 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

£322
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 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 £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 8538 reviews
8.5Crew
7.8Comfort
7.2Food
7.8Entertainment
8.1Boarding
Airline reviews

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.

6.0 GoodWenny, Aug 2026
Read more Delta reviews

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.

We got stuck on the tarmac taxiing after landing early so we didn’t get off the plane until an hour later than we thought we would

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

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 plane left over an hour late. I missed my connection going to Tokyo. They haven’t sent my bag to Thailand, where I ended up. It took me over 32 hours to get here. Very bad experience so far. I hope they can fix this and get my bag to me, within 24 hours it doesn’t look good at this time.

This flight did not take place because the passenger was in the hospital. We have made so many attempts to rebook this flight and have spoken to so many United Airlines representatives and everyone is giving you a different answer. It has become beyond frustrating to the point where we now have to seek legal help. This is a family of 4 so a lot of money was spent to purchase 4 tickets to go visit their daughter/sister who is a US servicewoman in Okinawa and to be treated with such disdain and disrespect is beyond reprehensible. The main traveler was given sent a letter by United confirming a refund on the tickets and to be able to use them but every attempt to use this has been met with a negative response so much so that the client is over stressed.

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.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario