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

Return flights

15 Dec - 29 Dec	SWISS
11 Dec - 28 Dec	ITA Airways
04 Dec - 07 Dec	SWISS
04 Dec - 10 Dec	SWISS
17 Dec - 15 Jan	Aer Lingus
09 Dec - 14 Dec	Aer Lingus
09 Dec - 15 Dec	Aer Lingus
16 Dec - 18 Jan	Aer Lingus
15 Dec - 18 Jan	Aer Lingus
11 Dec - 14 Jan	Aer Lingus
15 Dec - 17 Jan	Aer Lingus
14 Dec - 29 Dec	SWISS
22 Dec - 29 Dec	SWISS
10 Dec - 15 Dec	Aer Lingus
17 Dec - 06 Jan	Aer Lingus
11 Dec - 15 Jan	Aer Lingus
17 Dec - 30 Dec	SWISS
29 Dec - 04 Jan	KLM
09 Dec - 11 Jan	Aer Lingus
27 Dec - 01 Jan	Aer Lingus

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 $1058

Return flights