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

Return flights

10 Dec - 14 Jan	Lufthansa
10 Dec - 19 Jan	Lufthansa
11 Dec - 19 Jan	Lufthansa
10 Dec - 25 Jan	Delta
01 Dec - 07 Dec	SWISS
16 Dec - 13 Jan	Lufthansa
02 Dec - 07 Dec	SWISS
02 Dec - 09 Dec	Delta
05 Dec - 09 Dec	Delta
04 Dec - 09 Dec	Delta
16 Dec - 15 Jan	Lufthansa
05 Dec - 07 Dec	SWISS
04 Dec - 07 Dec	SWISS
03 Dec - 07 Dec	SWISS
09 Dec - 13 Jan	SWISS
11 Dec - 08 Jan	Delta
09 Dec - 08 Jan	Delta
10 Dec - 24 Jan	SWISS
05 Dec - 15 Dec	KLM
03 Dec - 08 Dec	SWISS

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 $549

Return flights