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.

$404 CHEAP FLIGHTS from Europe to Ontario

Save 19% or more on flights. Compare deals from all over the web.

Never overpay with our price tracking tools.

Filter searches by price, airline and more to find your best flights.

Flight Deals

Cheap Flights from Europe to Ontario

Discover the best prices for you by selecting your travel dates on KAYAK.

Round-trip

One-way

Last minute

Recent round-trip flight deals from Europe to Ontario

Thu, Oct 29 - Tue, Nov 3

2:45 pm - 10:17 amLHR London Heathrow-ONT Ontario

26h 32m1 stop Seattle/Tacoma Intl

12:02 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

$553Alaska Airlines

Fri, Nov 6 - Fri, Nov 13

2:45 pm - 11:06 pmLHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

12:02 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

$554Alaska Airlines

Fri, Nov 6 - Sun, Nov 22

2:45 pm - 11:06 pmLHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

11:55 am - 12:20 pmONT Ontario-LHR London Heathrow

16h 25m1 stop Seattle/Tacoma Intl

$557Alaska Airlines

Tue, Oct 27 - Tue, Nov 3

2:45 pm - 10:17 amLHR London Heathrow-ONT Ontario

26h 32m1 stop Seattle/Tacoma Intl

12:02 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

$558Alaska Airlines

Wed, Jan 13 - Tue, Jan 19

2:45 pm - 10:41 pmLHR London Heathrow-ONT Ontario

15h 56m1 stop Seattle/Tacoma Intl

11:36 am - 12:20 pmONT Ontario-LHR London Heathrow

16h 44m1 stop Seattle/Tacoma Intl

$559Alaska Airlines

Fri, Nov 6 - Mon, Nov 9

2:45 pm - 11:06 pmLHR London Heathrow-ONT Ontario

16h 21m1 stop Seattle/Tacoma Intl

6:00 am - 12:20 pmONT Ontario-LHR London Heathrow

22h 20m1 stop Seattle/Tacoma Intl

$560Alaska Airlines

Mon, Nov 2 - Fri, Nov 13

2:45 pm - 11:18 amLHR London Heathrow-ONT Ontario

28h 33m1 stop Seattle/Tacoma Intl

12:02 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

$561Alaska Airlines

Thu, Oct 29 - Tue, Nov 3

2:45 pm - 11:42 pmLHR London Heathrow-ONT Ontario

15h 57m1 stop Seattle/Tacoma Intl

12:02 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

$562Alaska Airlines

Sat, Jan 23 - Sat, Jan 30

2:45 pm - 10:41 pmLHR London Heathrow-ONT Ontario

15h 56m1 stop Seattle/Tacoma Intl

11:36 am - 12:20 pmONT Ontario-LHR London Heathrow

16h 44m1 stop Seattle/Tacoma Intl

$563Alaska Airlines

Tue, Nov 3 - Tue, Nov 17

2:45 pm - 3:13 pmLHR London Heathrow-ONT Ontario

32h 28m1 stop Seattle/Tacoma Intl

12:02 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

$564Alaska Airlines

Recent last minute flight deals from Europe to Ontario

Wed, Oct 14 - Sat, Nov 14

5:00 pm - 10:17 amLHR London Heathrow-ONT Ontario

25h 17m1 stop Seattle/Tacoma Intl

12:02 pm - 12:20 pmONT Ontario-LHR London Heathrow

16h 18m1 stop Seattle/Tacoma Intl

$587Alaska Airlines

Wed, Oct 14 - Sun, Oct 18

5:00 pm - 6:00 pmLHR London Heathrow-ONT Ontario

33h 00m1 stop Seattle/Tacoma Intl

6:02 am - 3:05 pmONT Ontario-LHR London Heathrow

25h 03m1 stop Seattle/Tacoma Intl

$621Alaska Airlines

Thu, Oct 15 - Wed, Oct 21

10:55 am - 11:55 pmLHR London Heathrow-ONT Ontario

21h 00m1 stop Salt Lake City

1:35 pm - 10:00 amONT Ontario-LHR London Heathrow

12h 25m1 stop Salt Lake City

$647Virgin Atlantic

Fri, Oct 16 - Thu, Oct 29

10:55 am - 3:16 pmFRA Frankfurt am Main-ONT Ontario

37h 21m2 stops Dallas/Fort Worth Phoenix Sky Harbor Intl

6:15 am - 7:15 amONT Ontario-FRA Frankfurt am Main

17h 00m2 stops Phoenix Sky Harbor Intl Dallas/Fort Worth

$655American Airlines

Thu, Oct 15 - Thu, Oct 22

10:55 am - 11:55 pmLHR London Heathrow-ONT Ontario

21h 00m1 stop Salt Lake City

6:00 pm - 3:35 pmONT Ontario-LHR London Heathrow

13h 35m1 stop Seattle/Tacoma Intl

$662Virgin Atlantic

Thu, Oct 15 - Wed, Oct 21

4:20 pm - 10:43 pmLHR London Heathrow-ONT Ontario

38h 23m2 stops New York John F Kennedy Intl Seattle/Tacoma Intl

11:56 am - 11:20 amONT Ontario-LHR London Heathrow

15h 24m1 stop Seattle/Tacoma Intl

$670Virgin Atlantic

Fri, Oct 16 - Mon, Oct 26

2:15 pm - 11:55 pmFRA Frankfurt am Main-ONT Ontario

18h 40m2 stops Amsterdam Schiphol Salt Lake City

7:07 am - 7:50 amONT Ontario-FRA Frankfurt am Main

16h 43m1 stop Atlanta Hartsfield-Jackson

$671Delta

Thu, Oct 15 - Mon, Oct 26

10:40 am - 6:22 pmFRA Frankfurt am Main-ONT Ontario

16h 42m1 stop Atlanta Hartsfield-Jackson

7:07 am - 7:50 amONT Ontario-FRA Frankfurt am Main

16h 43m1 stop Atlanta Hartsfield-Jackson

$679KLM

Thu, Oct 15 - Wed, Oct 28

10:40 am - 6:22 pmFRA Frankfurt am Main-ONT Ontario

16h 42m1 stop Atlanta Hartsfield-Jackson

7:07 am - 7:50 amONT Ontario-FRA Frankfurt am Main

16h 43m1 stop Atlanta Hartsfield-Jackson

$680KLM

Fri, Oct 16 - Fri, Oct 23

11:40 am - 10:43 pmLHR London Heathrow-ONT Ontario

19h 03m1 stop Seattle/Tacoma Intl

1:35 pm - 10:00 amONT Ontario-LHR London Heathrow

12h 25m1 stop Salt Lake City

$680Virgin Atlantic

Useful Info

Low season	February
High season	June
Cheapest flight	$404

Best time to beat the crowds with an average 24% drop in price.

Most popular time to fly with an average 15% increase in price.

Flight from Barcelona 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.