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

Return flights

05 Dec - 07 Dec	SWISS
03 Dec - 07 Dec	SWISS
01 Dec - 25 Jan	Lufthansa
01 Dec - 26 Jan	Lufthansa
04 Dec - 07 Dec	SWISS
04 Dec - 08 Dec	KLM
01 Dec - 07 Dec	Lufthansa
10 Dec - 19 Jan	Lufthansa
04 Dec - 15 Jan	Lufthansa
04 Dec - 13 Jan	SWISS
02 Dec - 13 Jan	Lufthansa
03 Dec - 31 Jan	KLM
09 Dec - 24 Jan	SWISS
03 Dec - 09 Dec	SWISS
02 Dec - 09 Dec	SWISS
01 Dec - 27 Jan	Lufthansa
17 Dec - 14 Jan	Lufthansa
03 Dec - 13 Dec	Virgin Atlantic
05 Dec - 13 Dec	Virgin Atlantic
04 Dec - 13 Dec	Virgin Atlantic

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 452€

Return flights