$440 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 8/25. 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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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, Nov 2 - Mon, Nov 16
United Airlines Logo
9:30 am - 11:06 pm
LHR
-
ONT
21h 36m
2 stops
United Airlines Logo
6:00 am - 7:25 am
ONT
-
LHR
17h 25m
1 stop
$563United Airlines
Fri, Sep 4 - Mon, Sep 7
American Airlines Logo
2:20 pm - 12:03 pm
MXP
-
ONT
30h 43m
2 stops
American Airlines Logo
12:59 pm - 11:35 pm
ONT
-
MXP
25h 36m
2 stops
$577American Airlines
Thu, Oct 1 - Mon, Oct 5
American Airlines Logo
2:20 pm - 11:47 am
MXP
-
ONT
30h 27m
2 stops
American Airlines Logo
12:35 pm - 5:45 pm
ONT
-
MXP
20h 10m
2 stops
$578American Airlines
Thu, Oct 1 - Mon, Oct 5
American Airlines Logo
2:20 pm - 6:17 pm
MXP
-
ONT
36h 57m
2 stops
American Airlines Logo
7:20 am - 5:45 pm
ONT
-
MXP
25h 25m
2 stops
$580American Airlines
Thu, Oct 1 - Mon, Oct 5
American Airlines Logo
12:00 pm - 1:25 pm
FCO
-
ONT
34h 25m
2 stops
American Airlines Logo
1:31 pm - 5:25 pm
ONT
-
FCO
18h 54m
2 stops
$580American Airlines
Wed, Jul 8 - Mon, Jul 13
Lufthansa Logo
1:40 pm - 9:55 pm
LHR
-
ONT
16h 15m
1 stop
Lufthansa Logo
6:00 am - 7:25 am
ONT
-
LHR
17h 25m
1 stop
$581Lufthansa
Fri, Sep 4 - Tue, Sep 8
United Airlines Logo
2:50 pm - 8:53 pm
LHR
-
ONT
14h 03m
1 stop
United Airlines Logo
5:00 am - 9:00 am
ONT
-
LHR
20h 00m
2 stops
$593United Airlines
Mon, Jun 22 - Sat, Sep 19
British Airways Logo
1:10 pm - 9:31 am
FCO
-
ONT
29h 21m
1 stop
British Airways Logo
2:22 pm - 7:05 pm
ONT
-
FCO
19h 43m
2 stops
$601British Airways
Fri, Sep 4 - Tue, Sep 8
Air Canada Logo
9:30 am - 12:50 pm
LHR
-
ONT
35h 20m
2 stops
Air Canada Logo
5:00 am - 6:35 am
ONT
-
LHR
17h 35m
2 stops
$604Air Canada
Thu, Oct 1 - Mon, Oct 5
British Airways Logo
11:10 am - 10:43 pm
FCO
-
ONT
20h 33m
2 stops
British Airways Logo
10:25 am - 12:05 pm
ONT
-
FCO
16h 40m
1 stop
$606British Airways
Useful Info

Good to know

Low seasonJanuary
Cheapest flight$440
Best time to beat the crowds but there is an average 2% increase in price.
Most popular time to fly and prices are also 7% lower on average.
Flight from Amsterdam 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 airlines 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 9780 reviews
6.6Food
7.1Entertainment
7.7Boarding
7.3Comfort
8.1Crew
Airline reviews

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

10.0 ExcellentKaryn, Jun 2026
DEN - LAX
Read more United Airlines reviews

New plane was lovely. Crew customer service is always lax but expected. Kraft on time and arrived safely.

Uncomfortable plastic seats even in premium economy. No free wifi. Even paid wifi was spotty to nonexistent. Bad food. Much worse than economy on foreign carriers like Qantas.

How can you rate a flight when it is canceled after you leave the gate & 3 hours into sitting there or in remote area of airport after mechanical problems

Seat pitch is horrible especially on the 15 hour flight. Gate crew at SFO was Outstanding. The flight crew was also great.

6 1/2 hours from Tampa to SFO on a Boeing 737. Cramped. No Service. No real food. One pass for coffee at the beginning and a second pass THREE hours later. And check-in in Tampa was nasty even by United standards. And I am at almost TWO million miles on United. It's a non-stop. But terrible service.

First class ticket gets you no seat back entertainment? I have to bring my own laptop to see a movie? And most of their movies have ADS? No thank you. Worse: Tiny snacks only on a 2 hr flight?

Late plane. Only one crew on the ground so we b had to wait for Denver flight to come in, board, and depart. At 78 yrs of age I was not pleased trying to get my connection. What really made me angry was the notification you sent me to hurry up or I would miss my connection. Why tell me to hurry up when you got me in late. It was not a good way of treating customers.

No complaints other than luggage carousel was incorrectly guiding passengers to the wrong carousel on the screen.

Seats were not super comfortable and food was not good at all. If I had a chance I would definitely fly a different airline. Of course they are better than any budget airline, but not by much.

Flew steerage class. Short on leg room unless you pay more. No window unless you pay more. Etc. United is trying to squeeze every cent from you. It doesn’t make for any loyalty.

Lovely big plane. Excellent take off and landing. Cabin crew were so nice. Flight in time no delays

Because our ABZ-LHR flight was cancelled by BA for reasons they refuse to tell us--not weather--we did not make this flight and were booked on the following day. BA offered no assistance to us on the phone or in the airport, and we had to find a hotel at Heathrow on our own.

Horrible - flight was delayed by 6 hours - we boarded, were made to de-board due some technical fault; aircraft changed; special meals request on new flight - all went awry. Landed in Dulles airport; breezed thru immigration; as Business Class passengers or baggage was delivered almost 90 minutes after landing; air tags indicated the bags were just near the carousel but the unhelpful BA staff - Maria and Ghina refused to give any update - palming it off on some imaginary invisible “manager” despite air tags evidence showing it right there. So about 50-60 passengers waiting and getting infuriatingly impatient for their bags coz one container was not delivered. Finally after much argument by some other passengers Maria condescended to go to the “ramp” and within 5 minutes the baggage was delivered miraculously. Question is why couldn’t she have done it one hour earlier ? Poor poor experience once again on Business Class BA.

Cheap Flight Fares would not provide booking info. I canceled the reservation and we arbitrated with American Express. They provided erroneous info to Amex and it was determined that C.F.F. deserved the price of the ticket. Worse experience I've ever had.

Seating space is appalling. Seats and all surrounding area in "Economy" is built for individuals shorter than 4' 10" and below 120 lbs. Ridiculous. While I'm not expecting fine dining, the food was the worst airplane food that I can recall.

My luggage was lost at the airport but American Airlines contacted me and got it to me the next day.

Business class lounge for my gate was closed and no email was sent, causing me to walk back and forth to different gates, etc for over 20 minutes one way. Flight entertainment was mediocre with very poor choices especially for business class cabin. Original flight was cancelled and rebooking was difficult and no reason given for cancellation.

Very comfortable flight and simple and directed one way and back. Amazing price.

We loved our flight attendant, Emma from Scotland, the meal and entertainment offerings were wonderful, the flight was smooth, and enough leg room to stretch. We would fly with you again!

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.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario