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

Return flights

31 Dec - 16 Jan	Peach	direct
31 Dec - 01 Jan	Peach	direct
31 Dec - 07 Jan	Peach	direct
31 Dec - 05 Jan	Japan Airlines
28 Dec - 29 Dec	Japan Airlines
30 Dec - 07 Jan	StarFlyer
29 Dec - 29 Dec	Japan Airlines
31 Dec - 05 Jan	Peach	direct
31 Dec - 02 Jan	Peach	direct
31 Dec - 04 Jan	Peach	direct
30 Dec - 05 Jan	StarFlyer
31 Dec - 08 Jan	Asiana Airlines	direct
29 Dec - 30 Dec	Japan Airlines
28 Dec - 28 Dec	Korean Air	direct
28 Dec - 31 Dec	Korean Air	direct
29 Dec - 31 Dec	ANA

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 $376

Return flights