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

Return flights

31 Dec - 11 Jan	Air Canada
14 Dec - 14 Jan	Air Canada
28 Dec - 16 Jan	Air Canada
14 Dec - 24 Dec	Air Canada
30 Dec - 09 Jan	Porter Airlines (Canada) Ltd
14 Dec - 22 Dec	Air Canada
25 Dec - 13 Jan	Air Canada
28 Dec - 17 Jan	Air Canada
31 Dec - 09 Jan	Air Canada
14 Dec - 13 Jan	Air Canada
14 Dec - 26 Dec	Air Canada
24 Dec - 11 Jan	Air Canada
27 Dec - 15 Jan	Air Canada
14 Dec - 27 Dec	Air Canada
15 Dec - 22 Dec	Air Canada
25 Dec - 29 Dec	Air Canada
14 Dec - 18 Dec	Air Canada
16 Dec - 23 Dec	Air Canada
14 Dec - 21 Dec	Air Canada
17 Dec - 24 Dec	Air Canada

Also check the deals for one-way flights from Toronto to London 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 Toronto to London in December from $694

Return flights