$321 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 4/20. 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

ศ., ก.ย. 11 - ส., ก.ย. 26
United Airlines Logo
7:00 am - 6:19 pm
VIE
-
ONT
20h 19m
2 stops
United Airlines Logo
7:00 am - 10:10 am
ONT
-
VIE
18h 10m
2 stops
$618United Airlines
อ., พ.ค. 5 - อ., มิ.ย. 2
United Airlines Logo
2:10 pm - 10:35 pm
LHR
-
ONT
16h 25m
1 stop
United Airlines Logo
1:50 pm - 2:10 pm
ONT
-
LHR
16h 20m
1 stop
$620United Airlines
ศ., เม.ย. 24 - ส., พ.ค. 9
Avianca Logo
1:50 pm - 9:45 pm
BCN
-
ONT
40h 55m
2 stops
Avianca Logo
11:35 pm - 8:45 am
ONT
-
BCN
24h 10m
2 stops
$636Avianca
ศ., เม.ย. 24 - ส., พ.ค. 9
Avianca Logo
1:50 pm - 9:45 pm
BCN
-
ONT
40h 55m
2 stops
Avianca Logo
11:35 pm - 8:45 am
ONT
-
BCN
24h 10m
2 stops
$637Avianca
ศ., เม.ย. 24 - อ., เม.ย. 28
Multiple Airlines Logo
8:15 am - 4:25 pm
DUS
-
ONT
17h 10m
2 stops
Multiple Airlines Logo
7:05 am - 10:50 am
ONT
-
DUS
18h 45m
2 stops
$646Multiple Airlines
พฤ., ต.ค. 1 - จ., ต.ค. 5
American Airlines Logo
7:10 am - 6:57 pm
DUS
-
ONT
20h 47m
2 stops
American Airlines Logo
2:22 pm - 9:00 pm
ONT
-
DUS
21h 38m
2 stops
$649American Airlines
พ., ก.ย. 16 - พ., ก.ย. 30
Multiple Airlines Logo
6:20 am - 6:01 pm
DUS
-
ONT
20h 41m
2 stops
Multiple Airlines Logo
9:55 am - 1:50 pm
ONT
-
DUS
18h 55m
2 stops
$669Multiple Airlines
พ., เม.ย. 29 - อา., พ.ค. 10
KLM Logo
6:20 am - 6:33 pm
DUS
-
ONT
21h 13m
2 stops
KLM Logo
9:50 am - 1:55 pm
ONT
-
DUS
19h 05m
2 stops
$675KLM
อา., พ.ค. 17 - อ., มิ.ย. 2
KLM Logo
8:15 am - 4:17 pm
DUS
-
ONT
17h 02m
2 stops
KLM Logo
1:35 pm - 5:40 pm
ONT
-
DUS
19h 05m
2 stops
$685KLM
ศ., ก.ค. 3 - พ., ก.ค. 15
American Airlines Logo
12:15 pm - 11:59 pm
LHR
-
ONT
19h 44m
2 stops
American Airlines Logo
10:10 pm - 9:40 am
ONT
-
LHR
27h 30m
2 stops
$693American Airlines
Useful Info

Good to know

Low seasonNovember
Cheapest flight$321
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly with an average 17% increase in price.
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 9562 reviews
6.6Food
8.1Crew
7.1Entertainment
7.7Boarding
7.3Comfort
Airline reviews

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

10.0 ExcellentMitchell, Apr 2026
EWR - SFO
Read more United Airlines reviews

Flight left on time, arrived early, pleasant staff provided water, coffee, etc. access to bathrooms was reasonable and were well maintained. blankets were available, lots of entertainment options. LUGGAGE SERVICE WAS GREAT. I got my one checked bag quickly and was able to make a bus connection for a 2 hour bus ride saving me from waiting another 1.5 hours.

Terrible, if possible won't be flying again anytime soon!

Wonderful in-seat entertainment with seatback screens and huge selection of quality movies. The ability to bluetooth connect headphones was amazing.

we did a return flight from Paris CDG to SFO. This trip was much better than the departing flight SFO to CDG. The food was better quality, the crew was nicer, and the interior of the plane seemed cleaner.

Horrible service no Wi-Fi connection on both leg of the flight and they are refusing to fix bad service

We got to get extended leg room in Econ plus that was great. It was nice having our own dietary needs met with our meals, and the connecting flights had it as well. Only negative were the seats my bottom was/is really sore after a ten plus hour flight. Those seats are horrible, understandable for as many people use them. So we are going to purchase a gel seat pad.

Flight to Japan was was better across the board than the return to USA. Entertainment: Movie selection was old and not to my liking. Way too many woke choices. Not enough selections for sports or drama. Service: some of the crew were great. Not all. I paid for business class. a premium. Some of the crew thought they 'had' t do there job instead of wanting to serve and be polite. Food: Way to Japan was good. Way back to USA bad. Boarding: Wat out did not offer Business only; had to go thru general. If you pay for business, you should get business perks. Suggest you look for other than United for travel to Asia

I will never fly ANA again. They lost one of my large pieces of checked luggage, the heaviest one with the most valuable items in it, and they said they will not send me an email unless they can't find it, even though the paper they gave me to track the status of my lost luggage requires a code from an email they are supposed to send me so I can do baggage tracing. They claim to be an international airline, but they also insist on calling a Japanese telephone number to confirm where to send the lost baggage if they find it. It is impossible to find an actual contact email address for customer support on their website, and their AI chatbot is unhelpful, directing you to a webpage that says it is for contact information but does not have any actual email addresses or phone numbers listed on it. My seat in economy did not recline at all, even though I was not sitting in an exit row nor the very back row. I had to sit in the fully upright position for over ten hours of international travel. Awful experience overall.

The head flight attendant made the trip excellent. He was very accommodating.

The economy seats on the 777 was not as cramped as I had feared, but the food was terrible.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario