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

Return flights

02 Sep - 01 Oct	ANA
02 Sep - 06 Oct	ANA
16 Sep - 21 Oct	United
11 Sep - 25 Sep	United
10 Sep - 08 Oct	United
02 Sep - 18 Sep	United
04 Sep - 25 Sep	United
16 Sep - 30 Sep	United
23 Sep - 07 Oct	United
10 Sep - 06 Oct	United
08 Sep - 20 Sep	ANA
02 Sep - 09 Sep	ANA
28 Sep - 05 Oct	Porter Airlines (Canada) Ltd
02 Sep - 24 Sep	ANA
07 Sep - 06 Oct	United
22 Sep - 12 Oct	WestJet
11 Sep - 24 Sep	Air Canada
17 Sep - 24 Sep	Air Canada
18 Sep - 25 Sep	Air Canada
11 Sep - 01 Oct	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 705€

Return flights