$441 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 5/5. 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
$492
Typical prices: $583-$831
United Airlines
Tue 3/3Tue 3/17
LHR - ONT • 2 stops
Cheapest one-way
$441
British Airways
Tue 5/5
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

Tue, Mar 3 - Tue, Mar 17
United Airlines Logo
6:35 am - 5:41 pm
LHR
-
ONT
19h 06m
2 stops
United Airlines Logo
1:50 pm - 9:40 am
ONT
-
LHR
12h 50m
1 stop
$492United Airlines
Tue, Mar 3 - Tue, Mar 17
United Airlines Logo
10:05 am - 5:41 pm
LHR
-
ONT
15h 36m
1 stop
United Airlines Logo
1:50 pm - 9:40 am
ONT
-
LHR
12h 50m
1 stop
$525United Airlines
Wed, Jul 1 - Sat, Aug 1
Virgin Atlantic Logo
10:55 am - 4:14 pm
LHR
-
ONT
13h 19m
1 stop
Virgin Atlantic Logo
2:00 pm - 12:10 pm
ONT
-
LHR
14h 10m
1 stop
$527Virgin Atlantic
Sat, Feb 28 - Sun, Mar 8
United Airlines Logo
6:30 am - 5:41 pm
LHR
-
ONT
19h 11m
2 stops
United Airlines Logo
1:50 pm - 9:40 am
ONT
-
LHR
12h 50m
1 stop
$528United Airlines
Tue, Mar 3 - Tue, Mar 17
Air Canada Logo
1:25 pm - 12:43 pm
LHR
-
ONT
31h 18m
2 stops
Air Canada Logo
6:15 am - 6:30 am
ONT
-
LHR
17h 15m
2 stops
$532Air Canada
Sat, Feb 28 - Sun, Mar 8
Air Canada Logo
1:25 pm - 12:43 pm
LHR
-
ONT
31h 18m
2 stops
Air Canada Logo
6:15 am - 11:50 am
ONT
-
LHR
22h 35m
2 stops
$544Air Canada
Wed, Apr 15 - Thu, Apr 30
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:59 am - 8:05 am
ONT
-
LHR
13h 06m
1 stop
$553British Airways
Tue, Mar 10 - Tue, Mar 24
British Airways Logo
10:15 am - 6:42 pm
LHR
-
ONT
15h 27m
1 stop
British Airways Logo
10:56 am - 6:50 am
ONT
-
LHR
12h 54m
1 stop
$554British Airways
Thu, Apr 23 - Mon, May 4
Delta Logo
10:35 am - 11:13 am
FCO
-
ONT
33h 38m
2 stops
Delta Logo
11:53 am - 7:05 pm
ONT
-
FCO
22h 12m
2 stops
$631Delta
Tue, Mar 31 - Mon, Apr 13
Delta Logo
12:30 pm - 10:34 pm
FCO
-
ONT
19h 04m
2 stops
Delta Logo
7:05 am - 10:50 am
ONT
-
FCO
18h 45m
1 stop
$642Delta
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$441
Best time to beat the crowds but there is an average 4% increase in price.
Most popular time to fly and prices are also 18% 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 9276 reviews
8.1Crew
6.6Food
7.3Comfort
7.1Entertainment
7.7Boarding
Airline reviews

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

10.0 ExcellentBill, Feb 2026
IAH - LAX
Read more United Airlines reviews

The power at the seat didn't work and the seat itself was difficult to adjust - this was a business class seat. Flight attendant gave me miles to compensate. The attendant was very professional and on top of his game the entire flight.

the whole trip was smooth, and as comfortable as flying is these days. flight crew was friendly and very courteous and helpful.

Very poor. The flight was delayed from Toronto because some forget to do there job . I got to my connecting gate in San Francisco 10 minutes before the departure.but this didn’t let me board even though the flight was still there for an other 30 minutes. The the gentleman at the unite airline desk told me that they usually wait for passengers but air Canada called and told them not to we I been rerouted to Manila instead of Hong Kong . In San Francisco they mad me check in my carryon bag . I was told the it will directly go yo ho chi minn cuyt but I was told that by the Vietnams airline desk that’s not there I’m 10 hours behind my scheduled flight and looks like I I’m going without baggage. I don’t have a chance of catching ..

First class ticket gets you a choice of chips or nuts. . Just like economy Southwest. Also no screen in the seats. This is first class???!

Flight arrived 30 min early and bag was waiting at the baggage pickup. United Club HNL was one of the nicest in the system

Mean flight attendant. I wanted to reuse my plastic cup, but he (Matthew) said he can't for safety. I then said "I don't want water then" and he poured me a glass. I hope Matthew gets herpes and spends the rest of his life poor, lonely, and homeless.

Yet another flight in which beverage and snack service was skipped. Other that that, firmly mediocre. Landed early, to gate late due to congestion at the gates. Airline's fault or airports fault: unknown.

Both flights delayed. 2nd flight over 3 hours late mechanical issues

Flight was delayed 45 minutes because originating flight was coming from Newark. No complimentary snacks were offered on this 5+ hour flight. No screens for the flight, but movies offered if you had already downloaded the United app (which I hadn't on my ipad). No USB ports, only a flimsy plug-in port near the bottom of the seat that was hard to see and kept coming unplugged.

It was good but only meal served is very less. Meantime good to add rice and chicken in one of meal

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario