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

Return flights

25 Sep - 02 Oct	ANA
19 Sep - 05 Oct	ANA
17 Sep - 16 Oct	WestJet
29 Sep - 28 Oct	WestJet
25 Sep - 08 Oct	Air Canada
24 Sep - 23 Oct	ANA
24 Sep - 25 Oct	FrenchBee
24 Sep - 26 Oct	FrenchBee
22 Sep - 22 Oct	FrenchBee
30 Sep - 07 Oct	Air Canada
23 Sep - 30 Sep	ANA
22 Sep - 30 Sep	Porter Airlines (Canada) Ltd
18 Sep - 25 Sep	WestJet
22 Sep - 29 Sep	FrenchBee
21 Sep - 28 Sep	Qatar Airways
19 Sep - 26 Sep	Qatar Airways
19 Sep - 27 Sep	ANA
17 Sep - 24 Sep	FrenchBee
20 Sep - 27 Sep	Air Transat
21 Sep - 22 Sep	Air Canada

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 755€

Return flights