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

Return flights

29 Dec - 09 Jan	Air Canada
01 Dec - 15 Dec	Lufthansa
17 Dec - 27 Dec	Lufthansa
01 Dec - 08 Dec	SWISS
26 Dec - 10 Jan	SWISS
24 Dec - 29 Dec	SWISS
08 Dec - 15 Dec	Air Canada
10 Dec - 17 Dec	SWISS
17 Dec - 04 Jan	TAP
29 Dec - 09 Jan	British Airways	direct
01 Dec - 15 Dec	British Airways	direct
24 Dec - 29 Dec	British Airways	direct
17 Dec - 27 Dec	British Airways	direct
21 Dec - 29 Dec	TAP
25 Dec - 04 Jan	Virgin Atlantic
26 Dec - 04 Jan	TAP
22 Dec - 02 Jan	TAP
22 Dec - 02 Jan	British Airways	direct
19 Dec - 09 Jan	TAP
20 Dec - 02 Jan	TAP

Also check the deals for one-way flights from London to Montreal 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 Montreal in December from $609

Return flights