$521 Find Cheap Flights from Europe to Ontario

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight to Ontario departing on 8/30. 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

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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

Sat, Aug 30 - Mon, Sep 15
KLM Logo
11:20 am - 7:11 pmLHR-ONT
15h 51m1 stop
KLM Logo
1:15 pm - 9:50 amONT-LHR
12h 35m1 stop
$521KLM
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Tue, Sep 23 - Sun, Oct 19
United Airlines Logo
7:20 am - 5:37 pmCDG-ONT
19h 17m2 stops
United Airlines Logo
9:36 am - 10:25 amONT-CDG
15h 49m1 stop
$536United Airlines
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Sat, Aug 30 - Mon, Sep 15
KLM Logo
11:20 am - 7:11 pmLHR-ONT
15h 51m1 stop
KLM Logo
1:15 pm - 9:50 amONT-LHR
12h 35m1 stop
$548KLM
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Mon, Nov 3 - Sun, Nov 9
United Airlines Logo
9:30 am - 10:31 pmCDG-ONT
22h 01m2 stops
United Airlines Logo
6:00 am - 9:40 amONT-CDG
18h 40m1 stop
$555United Airlines
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Tue, Nov 18 - Sun, Jan 11
British Airways Logo
7:15 am - 5:49 pmCDG-ONT
19h 34m2 stops
British Airways Logo
5:03 pm - 5:30 pmONT-CDG
15h 27m2 stops
$559British Airways
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Wed, Sep 3 - Wed, Nov 5
Virgin Atlantic Logo
11:45 am - 10:40 pmLHR-ONT
18h 55m2 stops
Virgin Atlantic Logo
1:00 pm - 10:00 amONT-LHR
13h 00m1 stop
$565Virgin Atlantic
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Wed, Sep 24 - Thu, Oct 2
Iberia Logo
11:00 am - 6:54 pmCDG-ONT
16h 54m1 stop
Iberia Logo
10:55 am - 10:00 amONT-CDG
14h 05m1 stop
$566Iberia
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Wed, Sep 10 - Sat, Sep 20
Iberia Logo
11:00 am - 10:33 pmCDG-ONT
20h 33m1 stop
Iberia Logo
10:53 am - 10:00 amONT-CDG
14h 07m1 stop
$567Iberia
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Sun, Aug 24 - Tue, Sep 9
Virgin Atlantic Logo
6:50 pm - 10:40 pmLHR-ONT
59h 50m2 stops
Virgin Atlantic Logo
6:05 am - 6:25 amONT-LHR
40h 20m2 stops
$577Virgin Atlantic
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Fri, Aug 8 - Sat, Sep 13
British Airways Logo
7:45 am - 1:39 pmLHR-ONT
37h 54m2 stops
British Airways Logo
10:53 am - 12:45 pmONT-LHR
17h 52m1 stop
$608British Airways
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Good to know

Low seasonFebruary
High seasonSeptember
Cheapest flight$521
Best time to beat the crowds with an average 25% drop in price.
Most popular time to fly with an average 4% increase in price.
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 3 airlines serving 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.
7.8
KLMOverall score based on 1368 reviews
7.1Entertainment
7.8Boarding
7.3Food
8.4Crew
7.7Comfort
Airline reviews

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

6.0 GoodKathleen P, Jun 2025EDI - AMS
Read more KLM reviews

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

Klm start boarding while somw air issue in the plan

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

This portion of the flight was through Indigo. A local carrier. So all economy seating. No real service some refreshments for purchase standard economy stuff.

You should not have to pay for WiFi in business class

Transfer at Amsterdam airport is very convenient and the airport is easy to navigate. Boarding was also quick and easy. Cabin crew were excellent and the meals were good, although lacking in options.

Boarded plane and then delayed 1.5 hours while on the plane

It was all good flight was on time, service was good I enjoyed a few movies and everything was smooth

Horrific. They missed my connecting flight to San Diego. I didn’t get there until Monday at 9am when I had a mandatory court settlement conference scheduled at 6am since we had parties on the east coast. This caused many issues. All because United apparently forgot to hold the doors open until my flight landed that only had a 10 minute delay. This was the last flight to Southern California. So I couldn’t even rent a car to finish the trip. United cannot be trusted when traveling on specific days and times since weather didn’t have anything to do with the delays.

My flight was delayed a very short period of time but they did not hold my connecting flight to San Diego, also through United. So they closed the doors before we got off our plane. They would only have to help the door open for another five to ten minutes. So I missed a court deadline for a manditory mediation settlement conference for my client. I had to get an associate to be there in person and be on the phone with him relaying what he needs to do the entire time. The court was very upset with me and so was my client. United cannot be trusted.

We were given vouchers we couldn’t use with a 5.5 hour delay

Really good 😊 the woman at the gate entrance was a little rude checking in our carry-on but i dont think she worked for the airline, she worked for the airport at sacramento, other than that amazing.

Boarding was mayhem. Late boarding by 15 minutes because of lack of staff (missing 1 flight attendant. We had to wait for an arrival of another plane before we could board). Flight was a little rough, but cannot blame on airlines.

Great experience…left a bit behind schedule but made up fir that in the air and landed 10 minutes early 😁

Airbus plane, nice and polite staff, entertainment even as it was a short flight.

United out of SFO is having issues with catering so none of our meals were loaded on the plane and no offer of compensation for our tickets purchased was offered.

The crew were good. The flight was on time. The entertainment choice was ok. But the food was bad, tasted and texture were awful.

After boarding we were waiting in the plane for more than one hour to take off without AC with very high temperature inside

The flight was an hour late leaving Heathrow. The food was mediocre. When we got to Austin, my husband’s luggage was missing. He filled out information at baggage claim. We are waiting to hear something. His name is Henry Jacob Braunig.

The food was very good and it came multiple times

Flight from LGW to JFK delayed by 4 hrs No explanation given until the pilot said the delay due to planned maintenance on the aircraft

We arrived late to London, and consequently were 5 min. late to be allowed through security for our next flight. Even though dozens of people missed the same flight, BA did not radio ahead to hold open security for an extra 5-10 min. to allow people to get on the flight. This caused an additional 6 hour delay in London after waiting over an hour in Customer Service to get rebooked. They did not have enough staff on hand to help people in a timely manner. Not at all happy with the BA's customer care or customer service.

All service prior to the flight was terrible: online check-in not working, no customer service tel,, multiple airport scanners not working, A huge mess.

CONSTANT ERROR MESSAGE THAT THE WIFI COULD NOT BE PURCHASED DUE TO INABILITY TO CONNECT PAYMENT SYSTEM VIA SATELLITE. THIS HAPPENED IN BOTH DIRECTIONS. THE MAIN REASON I TRAVEL IN PRIORITY IS TO BE ABLE TO WORK FOR WHICH I NEED ACCESS TO INTERNET. .

They lost my luggage. Lady who was helping with it in Austin was rude. Not very helpful!

Waited 3.25 hours in plane only to have the flight cancelled.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario

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