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

Return flights

07 Sep - 13 Sep	IndiGo
18 Sep - 25 Sep	IndiGo
09 Sep - 15 Sep	IndiGo
05 Sep - 15 Sep	Singapore Airlines
19 Sep - 30 Sep	Singapore Airlines
27 Sep - 11 Oct	Air India
26 Sep - 11 Oct	Thai Airways
25 Sep - 05 Oct	Air India

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 $476

Return flights