AirHint found the following cheapest return flights from Montreal (YUL) to Bangkok (BKK) in September 2025 (see full year).

Return flights

24 Sep - 01 Oct	ANA
30 Sep - 07 Oct	Air Canada
28 Sep - 05 Oct	ANA
17 Sep - 16 Oct	WestJet
29 Sep - 28 Oct	WestJet
24 Sep - 23 Oct	ANA
24 Sep - 26 Oct	Qatar Airways
24 Sep - 25 Oct	FrenchBee
17 Sep - 24 Sep	Air Canada
26 Sep - 24 Oct	Porter Airlines (Canada) Ltd
23 Sep - 30 Sep	ANA
27 Sep - 04 Oct	Air Canada
18 Sep - 25 Sep	Air Canada
22 Sep - 29 Sep	Air Canada
21 Sep - 28 Sep	Qatar Airways
19 Sep - 26 Sep	Japan Airlines
20 Sep - 27 Sep	Air Canada
19 Sep - 27 Sep	Qatar Airways
21 Sep - 22 Sep	Emirates

Also check the deals for one-way flights from Montreal to Bangkok 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 Bangkok in September from $843

Return flights