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

Return flights

16 Sep - 23 Sep	WestJet
22 Sep - 05 Oct	WestJet
17 Sep - 24 Sep	WestJet
23 Sep - 06 Oct	WestJet
11 Sep - 14 Oct	WestJet
22 Sep - 06 Oct	WestJet
24 Sep - 22 Oct	WestJet
10 Sep - 17 Sep	WestJet
11 Sep - 23 Sep	Porter Airlines (Canada) Ltd
17 Sep - 21 Oct	WestJet
09 Sep - 29 Oct	WestJet
08 Sep - 15 Sep	Porter Airlines (Canada) Ltd
28 Sep - 12 Oct	WestJet
26 Sep - 06 Oct	WestJet
26 Sep - 21 Oct	WestJet
11 Sep - 29 Sep	Porter Airlines (Canada) Ltd
18 Sep - 21 Sep	WestJet
09 Sep - 16 Sep	WestJet
09 Sep - 17 Sep	WestJet
11 Sep - 18 Sep	WestJet

Also check the deals for one-way flights from Toronto 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 Toronto to Bangkok in September from 637€

Return flights