AirHint found the following cheapest return flights from Indianapolis (IND) to Seoul (ICN) in December 2025 (see full year).

Return flights

10 Dec - 17 Dec	United
11 Dec - 30 Jan	United
14 Dec - 12 Jan	United
24 Dec - 08 Jan	Delta
24 Dec - 10 Jan	Delta
21 Dec - 09 Jan	Frontier Airlines
14 Dec - 08 Jan	Delta
14 Dec - 10 Jan	Delta
23 Dec - 08 Jan	Delta
22 Dec - 09 Jan	Delta
24 Dec - 06 Jan	United
11 Dec - 18 Dec	Korean Air
20 Dec - 31 Dec	Delta

Also check the deals for one-way flights from Indianapolis to Seoul in December.

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 Indianapolis to Seoul in December from $977

Return flights