$392 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 3/16. 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
$515
Overall average: $694
British Airways
Mon 3/30Mon 4/13
LHR - ONT • 1 stop
Cheapest one-way
$392
Avianca
Mon 3/16
BCN - 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

Mon, Mar 30 - Mon, Apr 13
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
$515British Airways
Wed, Aug 12 - Thu, Aug 27
Finnair Logo
12:55 pm - 10:14 pm
LHR
-
ONT
17h 19m
1 stop
Finnair Logo
10:50 am - 12:10 pm
ONT
-
LHR
17h 20m
1 stop
$528Finnair
Wed, Apr 8 - Mon, Apr 13
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
$531British Airways
Tue, Mar 24 - Sun, Apr 5
American Airlines Logo
6:00 pm - 11:31 am
LHR
-
ONT
24h 31m
2 stops
American Airlines Logo
11:58 pm - 6:20 am
ONT
-
LHR
22h 22m
1 stop
$540American Airlines
Wed, Jun 10 - Wed, Aug 19
Virgin Atlantic Logo
5:45 pm - 5:16 pm
LHR
-
ONT
31h 31m
1 stop
Virgin Atlantic Logo
7:00 am - 12:10 pm
ONT
-
LHR
21h 10m
1 stop
$541Virgin Atlantic
Thu, Apr 9 - Wed, Apr 22
Multiple Airlines Logo
10:55 am - 11:46 pm
FRA
-
ONT
21h 51m
1 stop
Multiple Airlines Logo
2:08 pm - 6:40 pm
ONT
-
FRA
19h 32m
2 stops
$596Multiple Airlines
Thu, Apr 9 - Wed, Apr 22
Multiple Airlines Logo
10:40 am - 10:36 pm
FRA
-
ONT
20h 56m
2 stops
Multiple Airlines Logo
2:08 pm - 6:40 pm
ONT
-
FRA
19h 32m
2 stops
$601Multiple Airlines
Tue, Apr 14 - Mon, Apr 27
United Airlines Logo
6:50 am - 6:02 pm
FCO
-
ONT
20h 12m
2 stops
United Airlines Logo
5:10 am - 12:20 pm
ONT
-
FCO
22h 10m
1 stop
$621United Airlines
Wed, May 27 - Sat, Jun 13
American Airlines Logo
12:00 pm - 11:59 pm
FCO
-
ONT
20h 59m
2 stops
American Airlines Logo
7:00 am - 8:05 pm
ONT
-
FCO
28h 05m
2 stops
$632American Airlines
Thu, Apr 9 - Sun, Apr 26
United Airlines Logo
2:20 pm - 8:36 pm
FCO
-
ONT
15h 16m
1 stop
United Airlines Logo
11:05 am - 1:20 pm
ONT
-
FCO
17h 15m
1 stop
$637United Airlines
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$392
Best time to beat the crowds but there is an average 3% increase in price.
Most popular time to fly and prices are also 19% lower on average.
Flight from Barcelona 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 9308 reviews
7.3Comfort
7.7Boarding
8.1Crew
7.1Entertainment
6.6Food
Airline reviews

Good flight. However, when booked flight with United, assumed the layover included by United in San Francisco of 1 hr and 40 minutes was sufficient . Not so and would recommend at least 2 hours or more. Needed to go through US immigration (very long lineups), then pick up bags, take all the way to another terminal, running because we did not have sufficient time. We made the flight because they held the door for us but luggage didn’t follow.

8.0 ExcellentLeslie, Feb 2026
BNE - SFO
Read more United Airlines reviews

Good flight. However, when booked flight with United, assumed the layover included by United in San Francisco of 1 hr and 40 minutes was sufficient . Not so and would recommend at least 2 hours or more. Needed to go through US immigration (very long lineups), then pick up bags, take all the way to another terminal, running because we did not have sufficient time. We made the flight because they held the door for us but luggage didn’t follow.

Very disappointing given gate agent behavior. Filed a formal complaint with United.

Flight delayed. WiFi connectivity very poor if not existant. Last minute arrival forced me to run to catch my connection.

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.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario