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

Return flights

03 Dec - 10 Dec	TAP
05 Dec - 12 Dec	TAP
01 Dec - 08 Dec	Air Transat
08 Dec - 15 Dec	TAP
10 Dec - 17 Dec	TAP
05 Dec - 15 Dec	TAP
29 Dec - 12 Jan	TAP
05 Dec - 10 Jan	TAP
09 Dec - 16 Dec	Air Transat
02 Dec - 09 Dec	Air Transat
29 Dec - 05 Jan	TAP
15 Dec - 22 Dec	TAP
04 Dec - 11 Dec	Air Transat
24 Dec - 12 Jan	Air Transat
31 Dec - 07 Jan	TAP
28 Dec - 08 Jan	TAP
14 Dec - 01 Jan	Air Canada
13 Dec - 07 Jan	Air Transat
22 Dec - 01 Jan	Air Transat
30 Dec - 06 Jan	Air Transat

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 418€

Return flights