AirHint found the following cheapest return flights from Kolkata (CCU) to Seoul (ICN) in September 2025 (see full year).

Return flights

04 Sep - 10 Sep	IndiGo
02 Sep - 08 Sep	IndiGo
02 Sep - 09 Sep	IndiGo
02 Sep - 05 Sep	IndiGo
18 Sep - 20 Sep	IndiGo
01 Sep - 09 Sep	Air India
11 Sep - 17 Sep	Thai Airways
19 Sep - 26 Sep	Thai Airways
28 Sep - 12 Oct	Thai Airways
26 Sep - 29 Oct	Thai Airways
12 Sep - 19 Sep	Thai Airways
27 Sep - 07 Oct	Air India
26 Sep - 30 Sep	Thai Airways
25 Sep - 06 Oct	IndiGo
27 Sep - 04 Oct	Thai Airways

Also check the deals for one-way flights from Kolkata to Seoul 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 Kolkata to Seoul in September from 381€

Return flights