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

Return flights

02 Sep - 16 Sep	ANA
23 Sep - 07 Oct	ANA
09 Sep - 07 Oct	United
17 Sep - 30 Sep	United
02 Sep - 23 Sep	ANA
13 Sep - 17 Sep	ANA
25 Sep - 02 Oct	ANA
06 Sep - 13 Sep	Porter Airlines (Canada) Ltd
13 Sep - 20 Sep	Porter Airlines (Canada) Ltd
19 Sep - 28 Sep	United
15 Sep - 20 Oct	United
10 Sep - 17 Sep	ANA
30 Sep - 07 Oct	ANA
24 Sep - 01 Oct	ANA
04 Sep - 11 Sep	WestJet
18 Sep - 25 Sep	Air Canada
29 Sep - 06 Oct	ANA
27 Sep - 04 Oct	ANA
01 Sep - 20 Oct	Air France
25 Sep - 26 Oct	Air France

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 676€

Return flights