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

Return flights

29 Dec - 19 Jan	Iberia
07 Dec - 10 Dec	LOT
01 Dec - 07 Dec	Iberia
07 Dec - 18 Dec	Lufthansa
14 Dec - 24 Dec	Iberia
07 Dec - 19 Dec	Lufthansa
10 Dec - 21 Dec	Finnair
28 Dec - 20 Jan	Finnair
28 Dec - 19 Jan	Finnair
12 Dec - 21 Dec	Finnair
21 Dec - 26 Dec	Finnair
20 Dec - 26 Dec	Finnair
21 Dec - 27 Dec	Finnair
21 Dec - 02 Jan	Finnair
27 Dec - 19 Jan	Iberia
21 Dec - 02 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 $733

Return flights