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

Return flights

15 Dec - 08 Jan	TAP
15 Dec - 12 Jan	TAP
05 Dec - 07 Dec	Air Canada
02 Dec - 11 Dec	Air Canada
02 Dec - 08 Dec	Air Canada
01 Dec - 07 Dec	Air Canada
03 Dec - 07 Dec	Air Canada
04 Dec - 11 Dec	Air Canada
04 Dec - 24 Dec	Air Canada
04 Dec - 08 Dec	Air Canada
15 Dec - 29 Dec	TAP
05 Dec - 09 Dec	Air Canada
03 Dec - 06 Jan	Air Canada
09 Dec - 07 Jan	Air Canada
15 Dec - 07 Jan	TAP
30 Dec - 17 Jan	Air Canada	direct
30 Dec - 30 Jan	Air Canada	direct
07 Dec - 07 Jan	Lufthansa
15 Dec - 17 Jan	Lufthansa
11 Dec - 10 Jan	Lufthansa

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 337€

Return flights