AirHint found the following cheapest return flights from Sydney (SYD) to Bangkok (BKK) in September 2026 (see full year).

Return flights

22 Sep - 06 Oct	VietJet Air
01 Sep - 18 Sep	AirAsia X
15 Sep - 18 Sep	VietJet Air
01 Sep - 28 Sep	VietJet Air
28 Sep - 10 Oct	VietJet Air
28 Sep - 09 Oct	VietJet Air
15 Sep - 30 Sep	VietJet Air
01 Sep - 30 Sep	VietJet Air
06 Sep - 15 Sep	Cebu Pacific
01 Sep - 28 Sep	Qantas	direct
15 Sep - 30 Sep	Thai Airways	direct
06 Sep - 15 Sep	Thai Airways	direct
01 Sep - 18 Sep	Thai Airways	direct
22 Sep - 06 Oct	Thai Airways	direct
28 Sep - 10 Oct	Thai Airways	direct
28 Sep - 09 Oct	Thai Airways	direct
24 Sep - 01 Oct	China Southern
24 Sep - 07 Oct	China Southern

Also check the deals for one-way flights from Sydney 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 Sydney to Bangkok in September from 330€

Return flights