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

Return flights

05 Dec - 07 Dec	TAP
03 Dec - 12 Dec	TAP
05 Dec - 12 Dec	TAP
03 Dec - 10 Dec	TAP
01 Dec - 10 Dec	TAP
07 Dec - 14 Dec	Air Transat
08 Dec - 15 Dec	TAP
01 Dec - 15 Dec	TAP
05 Dec - 14 Dec	TAP
01 Dec - 07 Dec	TAP
05 Dec - 13 Jan	Air Transat
29 Dec - 13 Jan	Porter Airlines (Canada) Ltd
29 Dec - 17 Jan	Air Transat
10 Dec - 15 Jan	TAP
27 Dec - 17 Jan	Air Transat
09 Dec - 09 Jan	Air Transat
26 Dec - 17 Jan	Air Transat
24 Dec - 17 Jan	Air Transat
30 Dec - 24 Jan	FrenchBee
10 Dec - 10 Jan	TAP

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 $444

Return flights