Find Cheap Flights from Ontario to London Heathrow (ONT - LHR)

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.
Compare vs. KAYAK all | none
Browse Origins:
Browse Destinations:

Dates flexible? Here are the best fares found in the past 48 hours...

Book cheap flights from Ontario to London Heathrow

(Round-trip)
Depart: Fri Sep 22 2017 Return: Thu Oct 12 2017 Trip spans 21 days
British Airways
British Airways
ONT
LHR
24h 00m
1 stop
LHR
ONT
35h 43m
2 stops
Depart: Thu Sep 28 2017 Return: Sat Oct 7 2017 Trip spans 10 days
Multiple Airlines
Multiple Airlines
ONT
LHR
21h 45m
1 stop
LHR
ONT
22h 17m
1 stop
Depart: Thu Nov 16 2017 Return: Thu Nov 23 2017 Trip spans 8 days
United
United
ONT
LHR
25h 05m
1 stop
LHR
ONT
18h 23m
2 stops
Depart: Sun Aug 20 2017 Return: Sun Sep 3 2017 Trip spans 15 days
American Airlines
American Airlines
ONT
LHR
16h 41m
1 stop
LHR
ONT
18h 20m
1 stop
Depart: Sun Aug 20 2017 Return: Sun Sep 3 2017 Trip spans 15 days
KLM
KLM
ONT
LHR
23h 10m
2 stops
LHR
ONT
20h 07m
2 stops
Depart: Fri Nov 10 2017 Return: Sun Nov 12 2017 Trip spans 3 days
British Airways
British Airways
ONT
LHR
18h 28m
1 stop
LHR
ONT
21h 20m
2 stops
Depart: Wed Nov 15 2017 Return: Sun Jan 14 2018 Trip spans 61 days
British Airways
British Airways
ONT
LHR
14h 55m
1 stop
LHR
ONT
24h 38m
2 stops
Depart: Sat Dec 23 2017 Return: Thu Jan 18 2018 Trip spans 27 days
British Airways
British Airways
ONT
LHR
19h 30m
1 stop
LHR
ONT
24h 38m
2 stops
Depart: Sat Oct 7 2017 Return: Sun Oct 15 2017 Trip spans 9 days
British Airways
British Airways
ONT
LHR
14h 55m
1 stop
LHR
ONT
18h 45m
1 stop
Depart: Tue Jan 9 2018 Return: Tue Jan 16 2018 Trip spans 8 days
British Airways
British Airways
ONT
LHR
12h 53m
1 stop
LHR
ONT
15h 25m
1 stop
Depart: Sun Aug 6 2017 Return: Sun Aug 20 2017 Trip spans 15 days
American Airlines
American Airlines
ONT
LHR
14h 46m
1 stop
LHR
ONT
15h 51m
1 stop
Depart: Mon Jul 24 2017 Return: Wed Sep 20 2017 Trip spans 59 days
$1960
Select
Aeromexico
Aeromexico
ONT
LHR
31h 38m
2 stops
LHR
ONT
32h 27m
2 stops
Depart: Sat Dec 30 2017 Return: Thu Jan 11 2018 Trip spans 13 days
British Airways
British Airways
ONT
LHR
14h 53m
1 stop
LHR
ONT
24h 38m
2 stops
Depart: Mon Dec 18 2017 Return: Tue Jan 9 2018 Trip spans 23 days
British Airways
British Airways
ONT
LHR
12h 53m
1 stop
LHR
ONT
15h 25m
1 stop
Depart: Wed Nov 15 2017 Return: Tue Nov 21 2017 Trip spans 7 days
British Airways
British Airways
ONT
LHR
12h 53m
1 stop
LHR
ONT
15h 25m
1 stop
Depart: Sat Aug 19 2017 Return: Sun Aug 27 2017 Trip spans 9 days
British Airways
British Airways
ONT
LHR
32h 39m
1 stop
LHR
ONT
15h 55m
1 stop
Depart: Sun Jul 30 2017 Return: Wed Aug 2 2017 Trip spans 4 days
$3563
Select
Virgin Atlantic
Virgin Atlantic
ONT
LHR
19h 00m
1 stop
LHR
ONT
16h 41m
1 stop
Depart: Mon Dec 18 2017 Return: Sun Dec 24 2017 Trip spans 7 days
British Airways
British Airways
ONT
LHR
12h 53m
1 stop
LHR
ONT
15h 40m
1 stop
Depart: Wed Aug 2 2017 Return: Sat Aug 12 2017 Trip spans 11 days
$2187
Select
United
United
ONT
LHR
12h 30m
1 stop
LHR
ONT
18h 05m
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.

We compile tonnes of data for you
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,
please send us an email and someone from our team will get back to you promptly.

Airports
Origin

Ontario
$583
Destination

London
$583