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

Return flights

10 Dec - 17 Dec	Vueling Airlines
06 Dec - 13 Dec	Ryanair
08 Dec - 15 Dec	LOT
10 Dec - 21 Dec	Lufthansa
08 Dec - 19 Dec	Etihad Airways
07 Dec - 14 Dec	Air France
15 Dec - 07 Jan	Lufthansa
22 Dec - 31 Dec	Finnair
14 Dec - 07 Jan	Lufthansa
14 Dec - 28 Dec	Finnair
16 Dec - 09 Jan	Finnair
17 Dec - 09 Jan	Finnair
28 Dec - 31 Dec	Scandinavian Airlines
12 Dec - 21 Dec	Lufthansa
27 Dec - 11 Jan	LOT
21 Dec - 02 Jan	Finnair
20 Dec - 02 Jan	Finnair
27 Dec - 16 Jan	Finnair
17 Dec - 09 Jan	Korean Air	direct
14 Dec - 07 Jan	Korean Air	direct

Also check the deals for one-way flights from Lisbon 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 Lisbon to Seoul in December from 564€

Return flights