AirHint found the following cheapest return flights from Montreal (YUL) to London (LTN) in September 2026 (see full year).

Return flights

08 Sep - 15 Sep	Air Transat
24 Sep - 01 Oct	Air Transat
14 Sep - 21 Sep	Air Transat
22 Sep - 29 Sep	Air Transat
10 Sep - 26 Sep	Air Transat
15 Sep - 22 Sep	Air Transat
16 Sep - 23 Sep	Air Transat
23 Sep - 30 Sep	Air Transat
14 Sep - 28 Sep	Air Transat
07 Sep - 14 Sep	Air Transat
09 Sep - 16 Sep	Air Transat
30 Sep - 07 Oct	Air Transat
24 Sep - 04 Oct	Air Transat
29 Sep - 06 Oct	Air Transat
27 Sep - 04 Oct	Air Transat
27 Sep - 18 Oct	Air Transat
28 Sep - 05 Oct	Air Transat
26 Sep - 03 Oct	Air Transat
25 Sep - 02 Oct	Air Transat
25 Sep - 10 Oct	Air Transat

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

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 September from $727

Return flights