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

Return flights

14 Sep - 24 Sep	IndiGo
19 Sep - 24 Sep	Nok Air
12 Sep - 18 Sep	Thai Lion Air
09 Sep - 19 Sep	IndiGo
25 Sep - 28 Sep	Air India
19 Sep - 22 Sep	Nok Air
12 Sep - 19 Sep	Thai Lion Air
14 Sep - 21 Sep	IndiGo
15 Sep - 24 Sep	Air Arabia
18 Sep - 02 Oct	IndiGo
26 Sep - 04 Oct	Nok Air
22 Sep - 06 Oct	Air Arabia
15 Sep - 19 Sep	Air Arabia
20 Sep - 27 Oct	Air Arabia
28 Sep - 02 Oct	Thai Lion Air
15 Sep - 01 Oct	IndiGo
11 Sep - 15 Oct	Sichuan Airlines
22 Sep - 09 Oct	Air Arabia
27 Sep - 03 Oct	IndiGo
17 Sep - 04 Oct	Air Arabia

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