$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 3/31. 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
$478
Typical prices: $568-$831
Virgin Atlantic
Mon 3/2Mon 3/9
LHR - ONT • 2 stops
Cheapest one-way
$434
Multiple Airlines
Tue 3/31
FCO - ONT • 3 stops
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We hope you love your trip to Ontario!
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 2 - Mon, Mar 9
Virgin Atlantic Logo
8:25 pm - 10:37 pm
LHR
-
ONT
34h 12m
2 stops
Virgin Atlantic Logo
11:59 am - 11:55 am
ONT
-
LHR
16h 56m
1 stop
$478Virgin Atlantic
Mon, Mar 2 - Mon, Mar 9
Virgin Atlantic Logo
2:30 pm - 10:37 pm
LHR
-
ONT
16h 07m
1 stop
Virgin Atlantic Logo
1:20 pm - 10:00 am
ONT
-
LHR
13h 40m
1 stop
$496Virgin Atlantic
Mon, Mar 16 - Mon, Mar 23
United Airlines Logo
8:30 am - 10:18 pm
LHR
-
ONT
20h 48m
2 stops
United Airlines Logo
1:50 pm - 9:40 am
ONT
-
LHR
12h 50m
1 stop
$500United Airlines
Thu, Feb 26 - Thu, Mar 5
United Airlines Logo
9:30 am - 8:50 pm
LHR
-
ONT
19h 20m
2 stops
United Airlines Logo
1:40 pm - 12:00 pm
ONT
-
LHR
14h 20m
1 stop
$510United Airlines
Tue, Feb 10 - Mon, Mar 2
Delta Logo
12:30 pm - 9:05 pm
LHR
-
ONT
16h 35m
1 stop
Delta Logo
1:10 pm - 10:00 am
ONT
-
LHR
12h 50m
1 stop
$523Delta
Fri, Feb 13 - Tue, Feb 17
British Airways Logo
7:05 am - 10:29 pm
DUS
-
ONT
24h 24m
2 stops
British Airways Logo
6:00 am - 6:05 pm
ONT
-
DUS
27h 05m
2 stops
$593British Airways
Wed, Apr 1 - Wed, Apr 8
British Airways Logo
1:10 pm - 10:06 am
FCO
-
ONT
29h 56m
1 stop
British Airways Logo
11:59 pm - 12:05 pm
ONT
-
FCO
27h 06m
1 stop
$613British Airways
Tue, Apr 21 - Thu, May 7
American Airlines Logo
10:00 am - 8:54 pm
FCO
-
ONT
19h 54m
2 stops
American Airlines Logo
10:59 am - 10:45 pm
ONT
-
FCO
26h 46m
2 stops
$633American Airlines
Wed, May 27 - Sun, Jun 14
American Airlines Logo
12:00 pm - 11:59 pm
FCO
-
ONT
20h 59m
2 stops
American Airlines Logo
1:10 pm - 10:40 pm
ONT
-
FCO
24h 30m
2 stops
$643American Airlines
Sat, Feb 14 - Sat, Feb 28
Delta Logo
6:15 am - 10:37 pm
DUS
-
ONT
25h 22m
2 stops
Delta Logo
1:15 pm - 7:40 am
ONT
-
DUS
33h 25m
2 stops
$691Delta
Useful Info

Good to know

Low seasonNovember
Cheapest flight$434
Best time to beat the crowds with an average 24% drop in price.
Most popular time to fly and prices are also 8% lower on average.
Flight from Rome 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 9219 reviews
7.1Entertainment
6.6Food
7.3Comfort
7.7Boarding
8.1Crew
Airline reviews

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???!

6.0 GoodAnonymous, Jan 2026
SLC - SFO
Read more United Airlines reviews

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.

Both flights delayed. 2nd flight over 3 hours late mechanical issues

Flight was delayed 45 minutes because originating flight was coming from Newark. No complimentary snacks were offered on this 5+ hour flight. No screens for the flight, but movies offered if you had already downloaded the United app (which I hadn't on my ipad). No USB ports, only a flimsy plug-in port near the bottom of the seat that was hard to see and kept coming unplugged.

It was good but only meal served is very less. Meantime good to add rice and chicken in one of meal

Teeny tiny bathrooms, crew was not realistic about when we'd arrive.

On the way my flight entertainment wouldn’t work the screen went black and no matter how many times I tried to turn it on it wouldn’t. Food was surprisingly good but the tray tables were tiny so you couldn’t get anything else on the table. The seats hardly go back and are not overly comfortable. Wouldn’t fly United again.

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

Everything you need to know for your flight to Ontario

Information on the airport you'll fly into in Ontario