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

Return flights

15 Dec - 19 Dec	ANA
19 Dec - 21 Dec	ANA
06 Dec - 07 Dec	ANA
07 Dec - 09 Dec	ANA
23 Dec - 26 Dec	ANA
18 Dec - 19 Dec	Japan Airlines
17 Dec - 18 Dec	Japan Airlines
10 Dec - 13 Dec	Japan Airlines
13 Dec - 27 Dec	Japan Airlines
22 Dec - 22 Dec	Japan Airlines
25 Dec - 02 Jan	Japan Airlines
24 Dec - 06 Jan	Japan Airlines
30 Dec - 02 Jan	Japan Airlines
25 Dec - 03 Jan	Japan Airlines
25 Dec - 04 Jan	Japan Airlines
30 Dec - 03 Jan	Japan Airlines
25 Dec - 06 Jan	Japan Airlines
26 Dec - 01 Jan	Japan Airlines
30 Dec - 01 Jan	Japan Airlines
28 Dec - 03 Jan	Japan Airlines

Also check the deals for one-way flights from Osaka 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 Osaka to Seoul in December from $326

Return flights