AirHint found the following cheapest return flights from Seoul (GMP) to Jakarta (CGK) in September 2025 (see full year).

Return flights

14 Sep - 21 Sep	Air China
19 Sep - 22 Sep	Air China
05 Sep - 13 Sep	Air China
05 Sep - 15 Sep	Air China
13 Sep - 20 Sep	Air China
12 Sep - 14 Sep	Air China
15 Sep - 22 Sep	Air China
10 Sep - 15 Sep	Air China
07 Sep - 13 Sep	Air China
03 Sep - 08 Sep	EVA Air
27 Sep - 13 Oct	EVA Air
26 Sep - 13 Oct	EVA Air
27 Sep - 14 Oct	EVA Air
27 Sep - 02 Oct	Air China
27 Sep - 04 Oct	Air China
02 Sep - 02 Oct	EVA Air
05 Sep - 05 Oct	Air China
30 Sep - 13 Oct	EVA Air
08 Sep - 07 Oct	Air China
10 Sep - 10 Oct	EVA Air

Also check the deals for one-way flights from Seoul to Jakarta 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 Seoul to Jakarta in September from $348

Return flights