$373 Find Cheap Flights from Europe to Ontario - Compare and Save

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Cheap Flights from Europe to Ontario

 
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Europe to Ontario

Fri, Oct 16 - Sat, Oct 31
United Airlines Logo
8:40 am - 10:51 pmLHR  London Heathrow-ONT Ontario
22h 11m2 stops Zurich San Francisco
United Airlines Logo
5:00 am - 9:40 amONT  Ontario-LHR London Heathrow
21h 40m1 stop Denver Intl
$511United Airlines
Sat, Nov 7 - Mon, Nov 30
United Airlines Logo
9:00 am - 8:15 pmLHR  London Heathrow-ONT Ontario
19h 15m2 stops Zurich San Francisco
United Airlines Logo
6:00 am - 7:25 amONT  Ontario-LHR London Heathrow
17h 25m1 stop San Francisco
$511United Airlines
Wed, Nov 4 - Fri, Dec 4
United Airlines Logo
9:00 am - 8:15 pmLHR  London Heathrow-ONT Ontario
19h 15m2 stops Zurich San Francisco
United Airlines Logo
7:00 am - 5:55 amONT  Ontario-LHR London Heathrow
14h 55m1 stop Chicago O'Hare Intl
$512United Airlines
Wed, Nov 4 - Fri, Dec 4
United Airlines Logo
9:00 am - 8:15 pmLHR  London Heathrow-ONT Ontario
19h 15m2 stops Zurich San Francisco
United Airlines Logo
6:40 pm - 8:35 pmONT  Ontario-LHR London Heathrow
17h 55m2 stops San Francisco Newark
$512United Airlines
Tue, Dec 1 - Sun, Dec 6
United Airlines Logo
9:00 am - 8:29 pmLHR  London Heathrow-ONT Ontario
19h 29m2 stops Zurich San Francisco
United Airlines Logo
11:26 am - 9:40 amONT  Ontario-LHR London Heathrow
38h 14m2 stops San Francisco Denver Intl
$512United Airlines
Tue, Dec 1 - Sun, Dec 6
United Airlines Logo
9:00 am - 8:29 pmLHR  London Heathrow-ONT Ontario
19h 29m2 stops Zurich San Francisco
United Airlines Logo
11:26 am - 11:15 amONT  Ontario-LHR London Heathrow
15h 49m1 stop San Francisco
$512United Airlines
Tue, Sep 15 - Mon, Nov 30
United Airlines Logo
8:45 am - 8:01 pmLHR  London Heathrow-ONT Ontario
19h 16m2 stops Zurich San Francisco
United Airlines Logo
5:00 am - 9:40 amONT  Ontario-LHR London Heathrow
20h 40m1 stop Denver Intl
$513United Airlines
Fri, Nov 20 - Sun, Nov 29
United Airlines Logo
7:30 am - 8:15 pmLHR  London Heathrow-ONT Ontario
20h 45m2 stops Frankfurt am Main San Francisco
United Airlines Logo
6:00 am - 7:25 amONT  Ontario-LHR London Heathrow
17h 25m1 stop San Francisco
$517United Airlines
Sat, Nov 14 - Tue, Nov 24
British Airways Logo
1:10 pm - 9:40 amFCO  Rome Fiumicino-ONT Ontario
29h 30m1 stop Dallas/Fort Worth
British Airways Logo
7:00 am - 10:45 amONT  Ontario-FCO Rome Fiumicino
18h 45m1 stop Dallas/Fort Worth
$601British Airways
Tue, Dec 1 - Tue, Dec 15
British Airways Logo
11:45 am - 11:20 pmLHR  London Heathrow-ONT Ontario
19h 35m1 stop Charlotte Douglas
British Airways Logo
12:42 pm - 12:15 pmONT  Ontario-LHR London Heathrow
15h 33m1 stop Dallas/Fort Worth
$619British Airways
Useful Info

Good to know

Low season

January
Best time to beat the crowds with an average 23% drop in price.
Most popular time to fly with an average 1% increase in price.

FAQs for booking flights from Europe to Ontario

  • How does KAYAK find such low prices on flights from Europe 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 from Europe to Ontario.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Europe to Ontario?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Ontario from Europe is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Europe 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 to Europe with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Europe 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 from Europe up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Europe to Ontario

 
Need help choosing which airline to fly with from Europe 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.
6.7
British AirwaysOverall score based on 8198 reviews
7.7Crew
6.4Food
7.0Boarding
6.5Entertainment
6.8Comfort
Airline reviews

Incredible. The upgrade to Business was a phenomenal way to end my trip, beyond grateful for the generosity and hospitality.

10.0 ExcellentAnonymous, Aug 2026
Read more British Airways reviews

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