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

Return flights

30 Sep - 07 Oct	Air Canada	direct
25 Sep - 02 Oct	Air Canada	direct
27 Sep - 04 Oct	Air Canada	direct
29 Sep - 06 Oct	Air Canada	direct
22 Sep - 29 Sep	Lufthansa	direct
20 Sep - 27 Sep	Air Canada
23 Sep - 30 Sep	Air Canada
28 Sep - 05 Oct	Air Canada	direct
26 Sep - 03 Oct	Air Canada	direct
06 Sep - 13 Sep	TAP
10 Sep - 17 Sep	TAP
14 Sep - 21 Sep	TAP
18 Sep - 25 Sep	TAP
03 Sep - 10 Sep	TAP
09 Sep - 16 Sep	TAP
13 Sep - 20 Sep	TAP
24 Sep - 01 Oct	TAP
24 Sep - 03 Oct	Air Canada
24 Sep - 03 Oct	British Airways	direct
24 Sep - 01 Oct	British Airways	direct

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 $656

Return flights