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Everything you should know
Flight Deals
Cheap Flights to Ontario
Here are some of the best deals found on KAYAK recently from the most popular airlines for return flights to Ontario that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.
Recent return flight deals to Ontario
Tue, 15 Dec - Tue, 12 Jan
14:45 - 16:05LHR London Heathrow-ONT Ontario
33h 20m1 stop Seattle/Tacoma Intl
11:36 - 12:20ONT Ontario-LHR London Heathrow
16h 44m1 stop Seattle/Tacoma Intl
£415Alaska Airlines
Sat, 31 Oct - Sat, 14 Nov
14:45 - 16:13LHR London Heathrow-ONT Ontario
32h 28m1 stop Seattle/Tacoma Intl
12:02 - 12:20ONT Ontario-LHR London Heathrow
16h 18m1 stop Seattle/Tacoma Intl
£415Alaska Airlines
Mon, 8 Feb - Tue, 16 Feb
20:25 - 22:43LHR London Heathrow-ONT Ontario
34h 18m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
07:00 - 09:00ONT Ontario-LHR London Heathrow
18h 00m1 stop Atlanta Hartsfield-Jackson
£476Virgin Atlantic
Mon, 8 Feb - Mon, 15 Feb
20:25 - 22:43LHR London Heathrow-ONT Ontario
34h 18m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
07:00 - 07:50ONT Ontario-LHR London Heathrow
16h 50m1 stop Atlanta Hartsfield-Jackson
£481Virgin Atlantic
Sun, 21 Feb - Sun, 28 Feb
10:45 - 16:12LHR London Heathrow-ONT Ontario
13h 27m1 stop Salt Lake City
12:00 - 09:00ONT Ontario-LHR London Heathrow
13h 00m1 stop Atlanta Hartsfield-Jackson
£497Multiple Airlines
Thu, 25 Feb - Mon, 1 Mar
12:40 - 22:14LHR London Heathrow-ONT Ontario
17h 34m1 stop Atlanta Hartsfield-Jackson
07:00 - 07:50ONT Ontario-LHR London Heathrow
16h 50m1 stop Atlanta Hartsfield-Jackson
£500KLM
Thu, 29 Oct - Wed, 11 Nov
09:00 - 22:48LHR London Heathrow-ONT Ontario
20h 48m2 stops Zurich San Francisco
07:00 - 07:55ONT Ontario-LHR London Heathrow
16h 55m1 stop Chicago O'Hare Intl
£557United Airlines
Thu, 29 Oct - Wed, 11 Nov
09:00 - 22:48LHR London Heathrow-ONT Ontario
20h 48m2 stops Zurich San Francisco
07:00 - 08:25ONT Ontario-LHR London Heathrow
17h 25m2 stops Chicago O'Hare Intl Newark
£557United Airlines
Mon, 8 Mar - Tue, 30 Mar
14:45 - 22:25LHR London Heathrow-ONT Ontario
15h 40m1 stop Dallas/Fort Worth
16:25 - 12:45ONT Ontario-LHR London Heathrow
12h 20m1 stop Phoenix Sky Harbor Intl
£596British Airways
Sat, 6 Mar - Fri, 12 Mar
14:35 - 22:10LHR London Heathrow-ONT Ontario
15h 35m1 stop Phoenix Sky Harbor Intl
16:25 - 13:35ONT Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
£604British Airways
Recent one-way flight deals to Ontario
Sat, 12 Dec
07:50 - 23:23LHR London Heathrow-ONT Ontario
23h 33m2 stops Dublin San Francisco
£321Multiple Airlines
Mon, 7 Dec
14:45 - 11:13LHR London Heathrow-ONT Ontario
28h 28m1 stop Seattle/Tacoma Intl
£345Alaska Airlines
Sun, 6 Dec
14:45 - 11:13LHR London Heathrow-ONT Ontario
28h 28m1 stop Seattle/Tacoma Intl
£345Alaska Airlines
Tue, 1 Dec
12:05 - 21:59LHR London Heathrow-ONT Ontario
17h 54m1 stop Houston George Bush Intcntl
£364Lufthansa
Mon, 7 Dec
07:30 - 20:38LHR London Heathrow-ONT Ontario
21h 08m2 stops Frankfurt am Main San Francisco
£387United Airlines
Wed, 9 Dec
09:30 - 20:38LHR London Heathrow-ONT Ontario
19h 08m2 stops Frankfurt am Main San Francisco
£388United Airlines
Sat, 20 Feb
19:40 - 18:48LGW London Gatwick-ONT Ontario
31h 08m2 stops Madrid Barajas Dallas/Fort Worth
£423British Airways
Thu, 14 Jan
06:15 - 23:13LHR London Heathrow-ONT Ontario
24h 58m2 stops Madrid Barajas Dallas/Fort Worth
£424British Airways
Mon, 8 Feb
13:40 - 22:43MAN Manchester-ONT Ontario
41h 03m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
£479Virgin Atlantic
Tue, 10 Nov
10:45 - 16:24LHR London Heathrow-ONT Ontario
13h 39m1 stop Salt Lake City
£898Virgin Atlantic
Recent last minute flight deals to Ontario
Thu, 22 Oct - Thu, 10 Dec
17:00 - 18:00LHR London Heathrow-ONT Ontario
33h 00m1 stop Seattle/Tacoma Intl
11:57 - 12:20ONT Ontario-LHR London Heathrow
16h 23m1 stop Seattle/Tacoma Intl
£416Alaska Airlines
Thu, 22 Oct - Fri, 4 Dec
17:00 - 23:42LHR London Heathrow-ONT Ontario
14h 42m1 stop Seattle/Tacoma Intl
06:00 - 12:20ONT Ontario-LHR London Heathrow
22h 20m1 stop Seattle/Tacoma Intl
£427Alaska Airlines
Sat, 24 Oct - Tue, 10 Nov
10:55 - 22:11LHR London Heathrow-ONT Ontario
19h 16m1 stop Salt Lake City
07:05 - 06:25ONT Ontario-LHR London Heathrow
15h 20m1 stop Atlanta Hartsfield-Jackson
£611Delta
Sat, 24 Oct - Thu, 12 Nov
11:40 - 22:43LHR London Heathrow-ONT Ontario
19h 03m1 stop Seattle/Tacoma Intl
11:57 - 10:40ONT Ontario-LHR London Heathrow
14h 43m1 stop Seattle/Tacoma Intl
£614Virgin Atlantic
Fri, 23 Oct - Wed, 11 Nov
11:40 - 22:43LHR London Heathrow-ONT Ontario
19h 03m1 stop Seattle/Tacoma Intl
07:05 - 07:50ONT Ontario-LHR London Heathrow
16h 45m1 stop Atlanta Hartsfield-Jackson
£621Delta
Fri, 23 Oct - Wed, 18 Nov
16:05 - 22:11LHR London Heathrow-ONT Ontario
38h 06m2 stops Boston Logan Intl Salt Lake City
06:00 - 07:05ONT Ontario-LHR London Heathrow
17h 05m2 stops Salt Lake City Minneapolis St Paul
£632Virgin Atlantic
Thu, 22 Oct - Sat, 14 Nov
10:05 - 15:16LHR London Heathrow-ONT Ontario
13h 11m1 stop Phoenix Sky Harbor Intl
16:51 - 13:35ONT Ontario-LHR London Heathrow
12h 44m1 stop Phoenix Sky Harbor Intl
£715British Airways
Tue, 20 Oct - Tue, 27 Oct
14:50 - 20:58LHR London Heathrow-ONT Ontario
14h 08m1 stop Denver Intl
13:29 - 09:40ONT Ontario-LHR London Heathrow
13h 11m1 stop Denver Intl
£722United Airlines
Fri, 23 Oct - Wed, 18 Nov
13:00 - 20:31LHR London Heathrow-ONT Ontario
15h 31m1 stop San Francisco
09:25 - 07:25ONT Ontario-LHR London Heathrow
14h 00m1 stop San Francisco
£723United Airlines
Tue, 20 Oct - Sun, 25 Oct
10:05 - 15:16LHR London Heathrow-ONT Ontario
13h 11m1 stop Phoenix Sky Harbor Intl
10:25 - 08:15ONT Ontario-LHR London Heathrow
14h 50m1 stop Dallas/Fort Worth
£743British Airways
All return flight deals to Ontario
Tue, 15 Dec - Tue, 12 Jan
14:45 - 16:05LHR London Heathrow-ONT Ontario
33h 20m1 stop Seattle/Tacoma Intl
11:36 - 12:20ONT Ontario-LHR London Heathrow
16h 44m1 stop Seattle/Tacoma Intl
£415Alaska Airlines
Sat, 31 Oct - Sat, 14 Nov
14:45 - 16:13LHR London Heathrow-ONT Ontario
32h 28m1 stop Seattle/Tacoma Intl
12:02 - 12:20ONT Ontario-LHR London Heathrow
16h 18m1 stop Seattle/Tacoma Intl
£415Alaska Airlines
Mon, 8 Feb - Tue, 16 Feb
20:25 - 22:43LHR London Heathrow-ONT Ontario
34h 18m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
07:00 - 09:00ONT Ontario-LHR London Heathrow
18h 00m1 stop Atlanta Hartsfield-Jackson
£476Virgin Atlantic
Mon, 8 Feb - Mon, 15 Feb
20:25 - 22:43LHR London Heathrow-ONT Ontario
34h 18m2 stops Amsterdam Schiphol Seattle/Tacoma Intl
07:00 - 07:50ONT Ontario-LHR London Heathrow
16h 50m1 stop Atlanta Hartsfield-Jackson
£481Virgin Atlantic
Sun, 21 Feb - Sun, 28 Feb
10:45 - 16:12LHR London Heathrow-ONT Ontario
13h 27m1 stop Salt Lake City
12:00 - 09:00ONT Ontario-LHR London Heathrow
13h 00m1 stop Atlanta Hartsfield-Jackson
£497Multiple Airlines
Thu, 25 Feb - Mon, 1 Mar
12:40 - 22:14LHR London Heathrow-ONT Ontario
17h 34m1 stop Atlanta Hartsfield-Jackson
07:00 - 07:50ONT Ontario-LHR London Heathrow
16h 50m1 stop Atlanta Hartsfield-Jackson
£500KLM
Thu, 29 Oct - Wed, 11 Nov
09:00 - 22:48LHR London Heathrow-ONT Ontario
20h 48m2 stops Zurich San Francisco
07:00 - 07:55ONT Ontario-LHR London Heathrow
16h 55m1 stop Chicago O'Hare Intl
£557United Airlines
Thu, 29 Oct - Wed, 11 Nov
09:00 - 22:48LHR London Heathrow-ONT Ontario
20h 48m2 stops Zurich San Francisco
07:00 - 08:25ONT Ontario-LHR London Heathrow
17h 25m2 stops Chicago O'Hare Intl Newark
£557United Airlines
Mon, 8 Mar - Tue, 30 Mar
14:45 - 22:25LHR London Heathrow-ONT Ontario
15h 40m1 stop Dallas/Fort Worth
16:25 - 12:45ONT Ontario-LHR London Heathrow
12h 20m1 stop Phoenix Sky Harbor Intl
£596British Airways
Sat, 6 Mar - Fri, 12 Mar
14:35 - 22:10LHR London Heathrow-ONT Ontario
15h 35m1 stop Phoenix Sky Harbor Intl
16:25 - 13:35ONT Ontario-LHR London Heathrow
13h 10m1 stop Phoenix Sky Harbor Intl
£604British 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.
Prices
Airlines
More
Good to know - Cheap tickets to Ontario
Low season | May |
|---|---|
High season | November |
Cheapest flight | £321 |
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
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or returns with a duration up to 40 days. The information is for flights to Ontario based on your location. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.
FAQs - booking Ontario flights
Top tips for finding cheap flights to Ontario
Reviews of the top 5 airlines flying to Ontario
See real verified KAYAK customer reviews for airlines flying to Ontario. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline from the United Kingdom to Ontario. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
7.9
Alaska AirlinesOverall score based on 13085 reviews
7.0Entertainment
8.1Boarding
7.0Food
7.8Comfort
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
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.
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
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.
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.
It's not United, but TSA security at Terminal A in Newark is a disaster and seriously makes me consider switching to flying out of JFK. The touchless TSA pre-check had a line of over 50 people and the bag screening was so slow that it limited the flow of people through the facial recognition process. It is the only airport that I frequent that has this issue and makes me reconsider whether I should fly out of Newark given the wasted time and frustration it causes. As I said, it is not a United issue but will impact United if people choose to stop utilizing Newark airport because of the poor experience.
The food could be much better. Also very unfortunate that most of business class seats were empty but I could not upgrade.
Bag got checked but I thought one personal item was guaranteed.
The seats are very small, that is all the staff did a good job.
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.
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
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.
More options for your flight to Ontario
Complete your trip to Ontario with a hotel stay or car hire
Information on the airport you'll fly into in Ontario
Cabin class types available on flights to Ontario
Cabin classes available on flights to Ontario. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
Flights from local origins to Ontario
Flights from all regions of United Kingdom to Ontario. Prices are the lowest found on KAYAK over the last 7 days. Price and availability is not guaranteed.
Flights from England to Ontariofrom £428
Flights to other popular destinations
The most popular flights on KAYAK according to clicks in the last 2 weeks. Prices are the lowest found on KAYAK over the last 7 days. Price and availability are not guaranteed.