$420 Find Cheap Flights from Europe to Ontario

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 3/4. 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
$466
Overall average: $679
United Airlines
Thu 1/22Mon 1/26
LHR - ONT • 2 stops
Cheapest one-way
$420
British Airways
Wed 3/4
LHR - ONT • 2 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

Thu, Jan 22 - Mon, Jan 26
United Airlines Logo
7:30 am - 9:58 pm
LHR
-
ONT
22h 28m2 stops
United Airlines Logo
1:24 pm - 9:40 am
ONT
-
LHR
12h 16m1 stop
$466United Airlines
Thu, Jan 22 - Mon, Jan 26
United Airlines Logo
7:30 am - 9:58 pm
LHR
-
ONT
22h 28m2 stops
United Airlines Logo
6:00 am - 7:30 am
ONT
-
LHR
17h 30m1 stop
$467United Airlines
Sat, Jan 17 - Sat, Jan 24
Virgin Atlantic Logo
10:45 am - 9:48 pm
LHR
-
ONT
19h 03m1 stop
Virgin Atlantic Logo
7:30 am - 10:30 am
ONT
-
LHR
19h 00m1 stop
$482Virgin Atlantic
Mon, Jan 26 - Sun, Feb 8
Virgin Atlantic Logo
2:30 pm - 10:51 pm
LHR
-
ONT
16h 21m1 stop
Virgin Atlantic Logo
10:30 pm - 9:00 am
ONT
-
LHR
26h 30m1 stop
$484Virgin Atlantic
Fri, Jan 16 - Sat, Jan 24
Multiple Airlines Logo
12:05 pm - 9:58 pm
LHR
-
ONT
17h 53m1 stop
Multiple Airlines Logo
1:24 pm - 7:10 am
ONT
-
LHR
33h 46m2 stops
$490Multiple Airlines
Thu, Jan 22 - Thu, Feb 5
British Airways Logo
10:40 am - 6:45 pm
BCN
-
ONT
17h 05m1 stop
British Airways Logo
10:58 am - 8:50 am
ONT
-
BCN
12h 52m1 stop
$519British Airways
Wed, Mar 25 - Thu, Apr 9
British Airways Logo
9:35 am - 6:42 pm
BCN
-
ONT
17h 07m1 stop
British Airways Logo
12:19 pm - 8:35 pm
ONT
-
BCN
23h 16m2 stops
$531British Airways
Thu, Jan 15 - Thu, Jan 29
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
$544American Airlines
Thu, Jan 22 - Thu, Feb 5
American Airlines Logo
11:00 am - 10:48 pm
BCN
-
ONT
20h 48m2 stops
American Airlines Logo
7:16 am - 9:45 am
ONT
-
BCN
17h 29m2 stops
$558American Airlines
Sat, Jan 17 - Wed, Jan 21
Multiple Airlines Logo
7:00 am - 6:45 pm
DUS
-
ONT
20h 45m2 stops
Multiple Airlines Logo
10:58 am - 10:20 pm
ONT
-
DUS
26h 22m2 stops
$589Multiple Airlines
Useful Info

Good to know

Low seasonNovember
Cheapest flight$420
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 9137 reviews
7.7Boarding
7.3Comfort
6.6Food
8.1Crew
7.1Entertainment
Airline reviews

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

2.0 MediocreGray, Dec 2025
IAH - SMF
Read more United Airlines reviews

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

Flight was timely, relatively comfortable, with decent entertainment and food served. Only problem encountered was with the free messaging which I highly appreciate, but it did not work from iphone to non-iphones.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario