$369 Find Cheap Flights from Europe to Ontario

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 2/11. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Everything you should know

Cheapest round-trip
$369
Overall average: $662
United Airlines
週三 2/11週三 2/25
LHR - ONT • 1 stop
Cheapest one-way
$432
Multiple Airlines
週日 4/26
BCN - ONT • 3 stops
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Flight Deals
Useful Info
Flight Deals

Cheap Flights from Europe to Ontario

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Europe 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 round-trip flight deals from Europe to Ontario

週三, 2月 11 - 週三, 2月 25
United Airlines Logo
12:05 pm - 9:58 pm
LHR
-
ONT
17h 53m1 stop
United Airlines Logo
8:00 am - 10:15 am
ONT
-
LHR
18h 15m1 stop
$369United Airlines
週四, 1月 22 - 週一, 1月 26
United Airlines Logo
7:30 am - 9:58 pm
LHR
-
ONT
22h 28m2 stops
United Airlines Logo
6:00 am - 6:20 am
ONT
-
LHR
16h 20m2 stops
$466United Airlines
週四, 2月 5 - 週四, 2月 12
Virgin Atlantic Logo
10:45 am - 11:58 pm
LHR
-
ONT
21h 13m1 stop
Virgin Atlantic Logo
1:15 pm - 6:25 am
ONT
-
LHR
33h 10m1 stop
$483Virgin Atlantic
週六, 2月 7 - 週三, 2月 11
Virgin Atlantic Logo
10:45 am - 9:48 pm
LHR
-
ONT
19h 03m1 stop
Virgin Atlantic Logo
12:41 pm - 11:40 am
ONT
-
LHR
14h 59m1 stop
$487Virgin Atlantic
週二, 3月 3 - 週一, 3月 9
British Airways Logo
10:40 am - 10:49 pm
BCN
-
ONT
21h 09m1 stop
British Airways Logo
2:39 pm - 5:55 pm
ONT
-
BCN
19h 16m2 stops
$531British Airways
週二, 3月 3 - 週一, 3月 9
British Airways Logo
11:20 am - 10:49 pm
BCN
-
ONT
20h 29m2 stops
British Airways Logo
2:39 pm - 5:55 pm
ONT
-
BCN
19h 16m2 stops
$538British Airways
週日, 1月 25 - 週二, 2月 10
American Airlines Logo
10:40 am - 6:45 pm
BCN
-
ONT
17h 05m1 stop
American Airlines Logo
10:58 am - 8:50 am
ONT
-
BCN
12h 52m1 stop
$558American Airlines
週日, 2月 1 - 週二, 2月 17
Iberia Logo
10:40 am - 10:48 pm
BCN
-
ONT
21h 08m1 stop
Iberia Logo
7:00 am - 8:50 am
ONT
-
BCN
16h 50m1 stop
$560Iberia
週五, 1月 23 - 週二, 1月 27
American Airlines Logo
8:40 am - 10:48 pm
BER
-
ONT
23h 08m2 stops
American Airlines Logo
6:00 am - 1:05 pm
ONT
-
BER
22h 05m2 stops
$600American Airlines
週五, 4月 3 - 週五, 4月 10
Iberia Logo
1:10 pm - 10:30 pm
FCO
-
ONT
18h 20m1 stop
Iberia Logo
7:30 am - 12:05 pm
ONT
-
FCO
19h 35m1 stop
$668Iberia
Useful Info

Good to know

Low seasonNovember
Cheapest flight$369
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from London Heathrow Airport to Ontario

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.
7.4
United AirlinesOverall score based on 9139 reviews
7.3Comfort
8.1Crew
6.6Food
7.7Boarding
7.1Entertainment
Airline reviews

On the way my flight entertainment wouldn’t work the screen went black and no matter how many times I tried to turn it on it wouldn’t. Food was surprisingly good but the tray tables were tiny so you couldn’t get anything else on the table. The seats hardly go back and are not overly comfortable. Wouldn’t fly United again.

4.0 OkayJaia, Jan 2026
AKL - SFO
Read more United Airlines reviews

On the way my flight entertainment wouldn’t work the screen went black and no matter how many times I tried to turn it on it wouldn’t. Food was surprisingly good but the tray tables were tiny so you couldn’t get anything else on the table. The seats hardly go back and are not overly comfortable. Wouldn’t fly United again.

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

Flight was late - I was downgraded from first class to coach

Movie selection is good. Crew did not understand mileage program and were no help. Sick later. Food?

United needs to step up their game. Delayed flight leaving Seattle, San Francisco. Older aircraft, not very comfortable.

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!!

Plane boarded early a quickly, was mostly full. We left close to on time. And landed early.

7 hours delayed due to operational issues on United’s end. Basically laziness.

Flight from Rome to SFO was excellent compared To our flight to Europe from SFO. The food was much tastier. You can see how UNITED is skimping, though. Instead of getting something mid flight you had to ask for it. It was not automatically served. There was a cookie at the end of the arrival meal, for example that tasted like it just came out of a box. They used to serve a little container of nuts, now … a tiny container of nuts, mixed with pretzels. This was business class that you really have to pay for! But this is minor complaints compared to the overall. My major complaint is the position of the even numbered seats by the windows. You have to turn around to see your window & the positioning as some other controls are harder to get at. This is compared to the odd number seat that are perfectly aligned.

The food quality sucks. One must starve if they do not eat flesh Or wheat based products Some variety would be expected. The trivial amount of snacks and or food is inhumane

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario