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

Return flights

02 Oct - 16 Oct	Air Transat	direct
04 Oct - 21 Oct	Air Transat	direct
05 Oct - 16 Oct	Air Transat
05 Oct - 14 Oct	Air Transat
01 Oct - 12 Oct	Air Transat
06 Oct - 17 Oct	Air Transat
09 Oct - 16 Oct	Air Transat
10 Oct - 14 Oct	Air Transat
11 Oct - 24 Oct	Air Transat
15 Oct - 22 Oct	Air Transat
15 Oct - 03 Nov	Air Transat
15 Oct - 09 Nov	Air Transat
15 Oct - 11 Nov	Air Transat
15 Oct - 05 Nov	Air Transat
15 Oct - 07 Nov	Air Transat
14 Oct - 05 Nov	Air Transat
14 Oct - 01 Nov	Air Transat
16 Oct - 06 Nov	Air Transat
09 Oct - 04 Nov	Air Transat
14 Oct - 04 Nov	Air Transat

Also check the deals for one-way flights from Montreal to London in October.

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 October from $465

Return flights