AirHint found the following cheapest return flights from Seoul (GMP) to Istanbul (IST) in September 2026 (see full year).

Return flights

05 Sep - 11 Sep	Air China
24 Sep - 04 Oct	Air China
18 Sep - 26 Sep	China Southern
25 Sep - 29 Sep	China Southern
23 Sep - 03 Oct	China Southern
22 Sep - 03 Oct	ANA
21 Sep - 26 Sep	China Southern
23 Sep - 10 Oct	China Southern
05 Sep - 12 Sep	ANA
08 Sep - 15 Sep	ANA
13 Sep - 22 Sep	ANA
22 Sep - 09 Oct	ANA
10 Sep - 17 Sep	ANA
07 Sep - 13 Sep	ANA
19 Sep - 08 Oct	ANA
23 Sep - 30 Sep	ANA
23 Sep - 11 Oct	ANA
24 Sep - 03 Oct	ANA

Also check the deals for one-way flights from Seoul 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 Seoul to Istanbul in September from 558€

Return flights