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

Return flights

09 Dec - 15 Dec	Air China
03 Dec - 10 Dec	Air China
10 Dec - 14 Dec	Air China
10 Dec - 17 Dec	China Eastern
11 Dec - 16 Dec	Air China
05 Dec - 12 Dec	China Eastern
03 Dec - 07 Dec	China Eastern
21 Dec - 24 Dec	China Eastern
12 Dec - 17 Dec	Air China
12 Dec - 16 Dec	Air China
28 Dec - 13 Jan	Etihad Airways
24 Dec - 10 Jan	Etihad Airways
28 Dec - 14 Jan	Etihad Airways
29 Dec - 13 Jan	Etihad Airways
15 Dec - 08 Jan	Lufthansa
14 Dec - 07 Jan	LOT
16 Dec - 07 Jan	Air France
31 Dec - 07 Jan	LOT
31 Dec - 11 Jan	LOT
31 Dec - 10 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 $470

Return flights