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

Return flights

03 Dec - 10 Dec	TAP
05 Dec - 12 Dec	TAP
03 Dec - 10 Dec	British Airways	direct
05 Dec - 15 Dec	TAP
08 Dec - 15 Dec	TAP
10 Dec - 17 Dec	TAP
06 Dec - 13 Dec	British Airways	direct
08 Dec - 15 Dec	British Airways	direct
05 Dec - 15 Dec	British Airways	direct
01 Dec - 08 Dec	TAP
05 Dec - 10 Jan	TAP
25 Dec - 01 Jan	British Airways	direct
29 Dec - 05 Jan	American Airlines
31 Dec - 07 Jan	TAP
24 Dec - 12 Jan	British Airways	direct
31 Dec - 07 Jan	British Airways	direct
22 Dec - 01 Jan	Finnair
28 Dec - 10 Jan	TAP
05 Dec - 10 Jan	British Airways	direct
29 Dec - 05 Jan	British Airways	direct

Also check the deals for one-way flights from Montreal 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 Montreal to London in December from 422€

Return flights