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

Return flights

17 Dec - 07 Jan	China Eastern
05 Dec - 11 Dec	Lufthansa
19 Dec - 10 Jan	Air China
05 Dec - 09 Dec	Lufthansa
10 Dec - 11 Dec	Lufthansa
03 Dec - 09 Dec	Lufthansa
03 Dec - 11 Dec	Lufthansa
03 Dec - 10 Dec	Lufthansa
05 Dec - 10 Dec	Lufthansa
03 Dec - 08 Dec	Lufthansa
04 Dec - 09 Dec	Lufthansa
30 Dec - 13 Jan	Etihad Airways
28 Dec - 13 Jan	Etihad Airways
10 Dec - 09 Jan	Lufthansa
29 Dec - 10 Jan	Etihad Airways
02 Dec - 11 Dec	Lufthansa
30 Dec - 10 Jan	Etihad Airways
16 Dec - 07 Jan	Air France
28 Dec - 09 Jan	LOT
29 Dec - 09 Jan	LOT

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 469€

Return flights