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

Return flights

09 Sep - 14 Sep	Air India
10 Sep - 14 Sep	Air India
18 Sep - 25 Sep	IndiGo
20 Sep - 23 Sep	Malaysia Airlines
21 Sep - 27 Sep	IndiGo
17 Sep - 26 Sep	Thai Airways
08 Sep - 15 Sep	Malaysia Airlines
26 Sep - 29 Sep	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 $513

Return flights