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

Return flights

20 Sep - 28 Sep	Thai Lion Air
17 Sep - 28 Sep	IndiGo
22 Sep - 28 Sep	Thai Lion Air
15 Sep - 21 Sep	Thai Lion Air
20 Sep - 27 Sep	Thai Lion Air
24 Sep - 28 Sep	Thai AirAsia
29 Sep - 11 Oct	IndiGo
11 Sep - 14 Sep	IndiGo
11 Sep - 16 Sep	IndiGo
15 Sep - 20 Sep	Thai Lion Air
15 Sep - 25 Sep	Thai Lion Air
26 Sep - 04 Oct	IndiGo
20 Sep - 05 Oct	IndiGo
30 Sep - 05 Oct	IndiGo
23 Sep - 01 Oct	Thai Lion Air
24 Sep - 01 Oct	IndiGo
21 Sep - 02 Oct	Thai Lion Air
29 Sep - 06 Oct	IndiGo
21 Sep - 20 Oct	Thai Lion Air
11 Sep - 07 Oct	IndiGo

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 $436

Return flights