AirHint found the following cheapest return flights from London (LHR) to Toronto (YYZ) in December 2025 (see full year).

Return flights

06 Dec - 15 Dec	Air Canada
05 Dec - 14 Dec	Air Canada
08 Dec - 15 Dec	Lufthansa
01 Dec - 15 Dec	Lufthansa
07 Dec - 14 Dec	Air Canada
06 Dec - 14 Dec	Air Canada
01 Dec - 14 Dec	Lufthansa
01 Dec - 07 Dec	Lufthansa
03 Dec - 10 Dec	Air Canada
02 Dec - 06 Jan	Air Canada
04 Dec - 11 Dec	Air Canada
16 Dec - 07 Jan	Air Canada
16 Dec - 06 Jan	Air Canada
04 Dec - 23 Jan	SWISS
24 Dec - 08 Jan	Lufthansa
05 Dec - 23 Jan	Air Canada
24 Dec - 10 Jan	Lufthansa
24 Dec - 07 Jan	Lufthansa
24 Dec - 06 Jan	Lufthansa
26 Dec - 07 Jan	Air Canada

Also check the deals for one-way flights from London to Toronto in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from London to Toronto in December from $441

Return flights