AirHint found the following cheapest return flights from Bangkok (DMK) to Istanbul (IST) in September 2025 (see full year).

Return flights

29 Sep - 06 Oct	Thai Lion Air
22 Sep - 29 Sep	Thai Lion Air
25 Sep - 18 Oct	Nok Air
25 Sep - 17 Oct	Nok Air
26 Sep - 10 Oct	Thai Lion Air
21 Sep - 23 Sep	Thai Lion Air
26 Sep - 03 Oct	Thai Lion Air
25 Sep - 05 Oct	Nok Air
26 Sep - 28 Sep	Thai Lion Air
23 Sep - 30 Sep	Thai Lion Air
22 Sep - 28 Sep	Thai Lion Air
25 Sep - 29 Sep	Nok Air
22 Sep - 25 Sep	Thai Lion Air
20 Sep - 23 Sep	Thai Lion Air
29 Sep - 09 Oct	Thai Lion Air
25 Sep - 27 Sep	Nok Air
20 Sep - 25 Sep	Thai Lion Air
28 Sep - 05 Oct	Thai Lion Air
28 Sep - 01 Oct	Thai AirAsia
27 Sep - 01 Oct	Thai AirAsia

Also check the deals for one-way flights from Bangkok to Istanbul 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 Bangkok to Istanbul in September from $388

Return flights