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

Return flights

31 Dec - 01 Jan	Skymark Airlines
31 Dec - 06 Jan	Peach
31 Dec - 04 Jan	Peach
30 Dec - 03 Jan	Air Busan	direct
30 Dec - 07 Jan	Jeju Air	direct
30 Dec - 02 Jan	Jin Air	direct
30 Dec - 12 Jan	T'way Air	direct
30 Dec - 06 Jan	T'way Air	direct
31 Dec - 04 Jan	Jeju Air	direct
30 Dec - 30 Dec	Air Japan	direct
30 Dec - 05 Jan	Jeju Air	direct

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

Return flights