Find Cheap Flights from Ontario to United Kingdom

Depart
Return
1 adult
Adults
18-64
Seniors
65+
Youths
12-17
Children
2-11
Seat Infants
under 2
Lap Infants
under 2
The price shown for each flight will be the average for all passengers including any infants.
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Book cheap flights from Ontario to United Kingdom

(Round-trip)
Depart: Wed Nov 15 2017 Return: Tue Nov 28 2017 Trip spans 14 days
British Airways
British Airways
ONT
LHR
18h 15m
1 stop
LHR
ONT
16h 05m
1 stop
Depart: Mon Dec 11 2017 Return: Mon Dec 25 2017 Trip spans 15 days
United
United
ONT
LHR
13h 15m
1 stop
LHR
ONT
14h 43m
1 stop
Depart: Fri Mar 9 2018 Return: Mon Mar 19 2018 Trip spans 10 days
American Airlines
American Airlines
ONT
LHR
13h 05m
1 stop
LHR
ONT
14h 09m
1 stop
Depart: Sun Nov 19 2017 Return: Sat Dec 2 2017 Trip spans 14 days
KLM
KLM
ONT
LHR
18h 05m
2 stops
LHR
ONT
18h 32m
2 stops
Depart: Sun Nov 19 2017 Return: Wed Dec 13 2017 Trip spans 25 days
Air France
Air France
ONT
LHR
18h 05m
2 stops
LHR
ONT
19h 38m
2 stops
Depart: Fri Oct 27 2017 Return: Sun Nov 12 2017 Trip spans 17 days
Delta
Delta
ONT
LHR
19h 10m
1 stop
LHR
ONT
18h 02m
2 stops
Depart: Wed Mar 7 2018 Return: Mon Mar 26 2018 Trip spans 19 days
Multiple Airlines
Multiple Airlines
ONT
LGW
17h 05m
2 stops
LGW
ONT
20h 51m
2 stops
Depart: Wed Oct 11 2017 Return: Wed Oct 18 2017 Trip spans 8 days
Virgin Atlantic
Virgin Atlantic
ONT
LHR
19h 10m
1 stop
LHR
ONT
16h 29m
1 stop
Depart: Thu Nov 16 2017 Return: Sun Dec 3 2017 Trip spans 18 days
British Airways
British Airways
ONT
LHR
17h 25m
1 stop
LHR
ONT
17h 54m
1 stop
Depart: Tue Dec 12 2017 Return: Mon Dec 25 2017 Trip spans 14 days
United
United
ONT
LHR
13h 37m
1 stop
LHR
ONT
14h 43m
1 stop
Depart: Sun Nov 19 2017 Return: Fri Dec 1 2017 Trip spans 13 days
KLM
KLM
ONT
LHR
18h 05m
2 stops
LHR
ONT
19h 23m
2 stops
Depart: Sat Nov 18 2017 Return: Sun Nov 26 2017 Trip spans 9 days
American Airlines
American Airlines
ONT
LHR
13h 10m
1 stop
LHR
ONT
15h 20m
1 stop
Depart: Mon Nov 20 2017 Return: Sun Dec 3 2017 Trip spans 14 days
British Airways
British Airways
ONT
LHR
14h 35m
1 stop
LHR
ONT
15h 54m
1 stop
Depart: Wed Dec 13 2017 Return: Mon Dec 25 2017 Trip spans 13 days
United
United
ONT
LHR
15h 10m
1 stop
LHR
ONT
14h 43m
1 stop
Depart: Fri Oct 13 2017 Return: Sat Oct 21 2017 Trip spans 9 days
Virgin Atlantic
Virgin Atlantic
ONT
LHR
19h 10m
1 stop
LHR
ONT
14h 40m
1 stop
Depart: Sun Oct 15 2017 Return: Sun Nov 5 2017 Trip spans 22 days
Delta
Delta
ONT
LHR
19h 10m
1 stop
LHR
ONT
19h 27m
2 stops
Depart: Mon Oct 16 2017 Return: Fri Oct 20 2017 Trip spans 5 days
Multiple Airlines
Multiple Airlines
ONT
LGW
17h 00m
1 stop
LGW
ONT
21h 47m
1 stop
Depart: Fri Nov 24 2017 Return: Thu Dec 7 2017 Trip spans 14 days
British Airways
British Airways
ONT
LHR
19h 25m
1 stop
LHR
ONT
17h 54m
1 stop
Depart: Thu Mar 8 2018 Return: Tue Mar 20 2018 Trip spans 12 days
United
United
ONT
LHR
13h 00m
1 stop
LHR
ONT
14h 13m
1 stop
Depart: Mon Oct 23 2017 Return: Fri Nov 3 2017 Trip spans 12 days
KLM
KLM
ONT
LHR
37h 40m
2 stops
LHR
ONT
16h 59m
2 stops
* Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

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Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
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Airports
Origin

Ontario
$628
Destination

London
only $628
only $722