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

Return flights

18 Sep - 26 Sep	IndiGo
21 Sep - 25 Sep	IndiGo
13 Sep - 21 Sep	Singapore Airlines
06 Sep - 12 Sep	Malaysia Airlines
15 Sep - 23 Oct	Singapore Airlines
26 Sep - 30 Sep	Air India
20 Sep - 26 Sep	Air India
01 Sep - 15 Sep	Thai Airways
23 Sep - 01 Oct	IndiGo
27 Sep - 05 Oct	Air India
28 Sep - 06 Oct	Thai Airways
28 Sep - 05 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 414€

Return flights