Earn point on your loyalty program!arrow arc left

Cheap flights from Ontario (ONT) to London (LCY)

Know your dates, get live prices in seconds
airplane logo

pin logo

calendar
Departure
calendar backward
Return
airplane logo
1 Adults (11+)
0 Children (2~11)
0 Infants (0~2)
Save up to 31%
Book Flight + Hotel at the same time

How to find the cheapest flight from Ontario (ONT) to London (LCY)

How to find the cheapest flight from Ontario (ONT) to London (LCY)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Ontario (ONT) to London (LCY)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Ontario (ONT) to London (LCY)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.

Cheap flights from Ontario to London in April , May 2025

28 Apr - 21 May $ 1,340.00
ONT
Ontario
Alaska Airlines
2 STOPS
LCY
London
LCY
London
Alaska Airlines
2 STOPS
ONT
Ontario
Pick dates
28 Apr - 08 May $ 1,344.00
ONT
Ontario
Frontier Airlines
2 STOPS
LCY
London
LCY
London
Frontier Airlines
2 STOPS
ONT
Ontario
Pick dates
28 Apr - 15 May $ 1,344.00
ONT
Ontario
Frontier Airlines
2 STOPS
LCY
London
LCY
London
Frontier Airlines
2 STOPS
ONT
Ontario
Pick dates

Last minute flights from Ontario to London

23 Apr - 01 May $ 1,251.00
ONT
Ontario
Frontier Airlines
2 STOPS
LCY
London
LCY
London
Frontier Airlines
2 STOPS
ONT
Ontario
Pick dates
28 Apr - 30 Apr $ 1,481.00
ONT
Ontario
Alaska Airlines
2 STOPS
LCY
London
LCY
London
Alaska Airlines
2 STOPS
ONT
Ontario
Pick dates
23 Apr - 30 Apr $ 1,490.00
ONT
Ontario
Alaska Airlines
2 STOPS
LCY
London
LCY
London
Alaska Airlines
2 STOPS
ONT
Ontario
Pick dates

One-way flights to London from Ontario

7:05 AM - 11:00 AM
United Airlines
2 Stops
44h 35m
ONT - LCY
$ 458
Kiwi
Pick dates
10:53 AM - 11:50 AM
Swiss International Air Lines
2 Stops
17h 37m
ONT - LCY
$ 508
Kiwi
Pick dates
3:55 PM - 4:35 PM
Swiss International Air Lines
2 Stops
17h 20m
ONT - LCY
$ 567
Kiwi
Pick dates

How to find the cheapest flight from Ontario (ONT) to London (LCY)

Related info for your journey
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Ontario (ONT) to London (LCY)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.
How to find the cheapest flight from Ontario (ONT) to London (LCY)
Some placeholder content for the first accordion panel. This panel is shown by default, thanks to the .show class.