$434 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 4/7. 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

lun., mar. 30 - sáb., abr. 25
United Airlines Logo
10:35 am - 5:47 pm
LHR
-
ONT
15h 12m
1 stop
United Airlines Logo
7:00 am - 8:30 am
ONT
-
LHR
17h 30m
1 stop
$487United Airlines
jue., abr. 23 - jue., abr. 30
United Airlines Logo
9:30 am - 9:50 pm
LHR
-
ONT
20h 20m
2 stops
United Airlines Logo
7:00 am - 10:40 am
ONT
-
LHR
19h 40m
2 stops
$557United Airlines
jue., abr. 2 - lun., abr. 6
American Airlines Logo
10:00 am - 4:22 pm
FCO
-
ONT
39h 22m
2 stops
American Airlines Logo
2:39 pm - 10:40 pm
ONT
-
FCO
23h 01m
2 stops
$569American Airlines
vie., abr. 17 - dom., may. 3
British Airways Logo
10:05 am - 4:22 pm
LHR
-
ONT
14h 17m
1 stop
British Airways Logo
10:54 am - 8:05 am
ONT
-
LHR
13h 11m
1 stop
$571British Airways
jue., abr. 2 - lun., abr. 6
American Airlines Logo
1:10 pm - 10:30 pm
FCO
-
ONT
18h 20m
1 stop
American Airlines Logo
11:59 pm - 9:50 am
ONT
-
FCO
24h 51m
1 stop
$580American Airlines
sáb., ago. 22 - sáb., sep. 12
British Airways Logo
11:00 am - 4:24 pm
LHR
-
ONT
13h 24m
1 stop
British Airways Logo
1:31 pm - 10:30 am
ONT
-
LHR
12h 59m
1 stop
$587British Airways
mié., sep. 9 - mié., sep. 23
Multiple Airlines Logo
10:55 am - 9:50 pm
FRA
-
ONT
19h 55m
1 stop
Multiple Airlines Logo
2:56 pm - 10:45 pm
ONT
-
FRA
22h 49m
2 stops
$635Multiple Airlines
jue., abr. 23 - jue., abr. 30
Delta Logo
9:15 am - 10:37 pm
MXP
-
ONT
22h 22m
2 stops
Delta Logo
7:00 am - 2:45 pm
ONT
-
MXP
22h 45m
2 stops
$664Delta
jue., abr. 23 - jue., abr. 30
Delta Logo
2:35 pm - 1:39 pm
MAD
-
ONT
32h 04m
2 stops
Delta Logo
7:00 am - 11:20 am
ONT
-
MAD
19h 20m
2 stops
$753Delta
lun., abr. 20 - lun., may. 4
Multiple Airlines Logo
12:45 pm - 9:00 pm
MAD
-
ONT
17h 15m
1 stop
Multiple Airlines Logo
12:49 pm - 12:15 pm
ONT
-
MAD
14h 26m
1 stop
$759Multiple Airlines
Useful Info

Good to know

Low seasonJanuary
Best time to beat the crowds but there is an average 6% increase in price.
Most popular time to fly with an average 19% increase in price.

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 9418 reviews
7.3Comfort
8.1Crew
7.1Entertainment
7.7Boarding
6.6Food
Airline reviews

It was amazing. I had several upgraded seats on my flight out. Everything went smooth with no delays.

10.0 ExcellentEric, Mar 2026
NRT - LAX
Read more United Airlines reviews

It was amazing. I had several upgraded seats on my flight out. Everything went smooth with no delays.

Flight delayed for more than 16 hrs and no effort was spent to provide an alternate

Flight attendants were friendly & good service, food sucks, seats uncomfortable, not many Asian movies or shows flying from Hong Kong

Flight attendants had a little attitude. Food tastes no good.

Overall we had a good experience during our flight from San Francisco to Houston.

it was a very short flight so my expectations were low.

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.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

Ontario (ONT)