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

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

How to find the cheapest flight from Ontario (ONT) to London (LCY)
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How to find the cheapest flight from Ontario (ONT) to London (LCY)
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How to find the cheapest flight from Ontario (ONT) to London (LCY)
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Cheap flights from Ontario to London in December 2025 , January 2026

28 Dec - 19 Jan $ 1,230.00
ONT
Ontario
Frontier Airlines
2 STOPS
LCY
London
LCY
London
Frontier Airlines
2 STOPS
ONT
Ontario
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31 Dec - 19 Jan $ 1,253.00
ONT
Ontario
Frontier Airlines
3 STOPS
LCY
London
LCY
London
Frontier Airlines
2 STOPS
ONT
Ontario
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31 Dec - 19 Jan $ 1,289.00
ONT
Ontario
Frontier Airlines
2 STOPS
LCY
London
LCY
London
Frontier Airlines
2 STOPS
ONT
Ontario
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Last minute flights from Ontario to London

28 Dec - 02 Jan $ 1,679.00
ONT
Ontario
Frontier Airlines
2 STOPS
LCY
London
LCY
London
Frontier Airlines
3 STOPS
ONT
Ontario
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29 Dec - 02 Jan $ 1,769.00
ONT
Ontario
Frontier Airlines
2 STOPS
LCY
London
LCY
London
Frontier Airlines
3 STOPS
ONT
Ontario
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28 Dec - 01 Jan $ 1,889.00
ONT
Ontario
Frontier Airlines
2 STOPS
LCY
London
LCY
London
Frontier Airlines
3 STOPS
ONT
Ontario
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One-way flights to London from Ontario

6:00 AM - 4:25 PM
Swiss International Air Lines
2 Stops
27h 5m
ONT - LCY
$ 428
Kiwi
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10:42 AM - 4:25 PM
Swiss International Air Lines
2 Stops
22h 23m
ONT - LCY
$ 688
Kiwi
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10:42 AM - 4:25 PM
Swiss International Air Lines
2 Stops
22h 23m
ONT - LCY
$ 4,548
Kiwi
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How to find the cheapest flight from Ontario (ONT) to London (LCY)

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