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

Return flights

21 Sep - 28 Sep	Thai Lion Air
25 Sep - 02 Oct	Thai Lion Air
12 Sep - 12 Oct	Air Arabia
17 Sep - 28 Sep	Air Arabia
09 Sep - 15 Sep	Air Arabia
02 Sep - 06 Sep	Air India
09 Sep - 17 Sep	Air Arabia
04 Sep - 08 Sep	Air India
27 Sep - 12 Oct	IndiGo
02 Sep - 11 Sep	Air India
04 Sep - 11 Sep	IndiGo
09 Sep - 12 Sep	Air Arabia
04 Sep - 12 Sep	Air India
26 Sep - 10 Oct	Air Arabia
17 Sep - 09 Oct	Air Arabia
17 Sep - 04 Oct	Air Arabia
18 Sep - 05 Oct	Air India
25 Sep - 04 Oct	Thai Lion Air
30 Sep - 07 Oct	Thai Lion Air
23 Sep - 07 Oct	Thai Lion Air

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 373€

Return flights