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

Return flights

29 Sep - 01 Oct	IndiGo
19 Sep - 28 Sep	Thai AirAsia
22 Sep - 05 Oct	Thai Lion Air
28 Sep - 01 Oct	IndiGo
16 Sep - 25 Sep	Etihad Airways
16 Sep - 22 Sep	Etihad Airways
25 Sep - 30 Sep	Gulf Air
25 Sep - 02 Oct	Gulf Air
19 Sep - 26 Sep	Thai Lion Air
27 Sep - 04 Oct	IndiGo
21 Sep - 14 Oct	Etihad Airways
28 Sep - 19 Oct	IndiGo
18 Sep - 24 Sep	Air Arabia
27 Sep - 19 Oct	IndiGo
26 Sep - 30 Sep	IndiGo
18 Sep - 22 Sep	Etihad Airways
17 Sep - 19 Sep	Etihad Airways
28 Sep - 30 Sep	IndiGo
23 Sep - 04 Oct	Thai VietJet Air
24 Sep - 15 Oct	Etihad Airways

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.

Book a cheap hotel in Istanbul

Cheap car rent in Istanbul

Cheapest return flights from Bangkok to Istanbul in September from 391€

Return flights