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

Return flights

17 Dec - 31 Dec	Lufthansa
03 Dec - 31 Dec	Lufthansa
10 Dec - 14 Dec	Lufthansa
10 Dec - 16 Dec	Lufthansa
03 Dec - 10 Dec	Lufthansa
03 Dec - 11 Dec	Lufthansa
03 Dec - 07 Dec	Lufthansa
17 Dec - 30 Dec	Lufthansa
05 Dec - 09 Dec	Lufthansa
11 Dec - 16 Dec	Lufthansa
16 Dec - 16 Jan	Lufthansa
16 Dec - 07 Jan	Lufthansa
27 Dec - 12 Jan	LOT
31 Dec - 16 Jan	Lufthansa
31 Dec - 14 Jan	Lufthansa
31 Dec - 07 Jan	Lufthansa
31 Dec - 06 Jan	Lufthansa
29 Dec - 05 Jan	Lufthansa
31 Dec - 05 Jan	Lufthansa
29 Dec - 07 Jan	Lufthansa

Also check the deals for one-way flights from Seoul to Lisbon 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 Seoul to Lisbon in December from $583

Return flights