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 - 12 Dec	TAP
01 Dec - 10 Dec	TAP
01 Dec - 11 Dec	TAP
07 Dec - 14 Dec	TAP
02 Dec - 09 Dec	Air Transat
09 Dec - 16 Dec	Air Transat
01 Dec - 08 Dec	Air Transat
04 Dec - 11 Dec	Air Transat
10 Dec - 24 Jan	TAP
31 Dec - 23 Jan	TAP
29 Dec - 12 Jan	Air Transat
24 Dec - 16 Jan	Air Transat
09 Dec - 05 Jan	Air Transat
30 Dec - 16 Jan	FrenchBee
31 Dec - 07 Jan	TAP
26 Dec - 15 Jan	TAP
14 Dec - 12 Jan	TAP
23 Dec - 16 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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Montreal to London in December from $467

Return flights