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

Return flights

10 Dec - 12 Dec	Air China
10 Dec - 20 Dec	Air China
21 Dec - 04 Jan	Air China
09 Dec - 11 Dec	Air China
21 Dec - 31 Dec	Jeju Air
20 Dec - 26 Dec	Air China
18 Dec - 28 Dec	Air China
25 Dec - 02 Jan	China Southern
16 Dec - 28 Dec	Japan Airlines
10 Dec - 28 Dec	Japan Airlines
15 Dec - 08 Jan	Japan Airlines
03 Dec - 14 Jan	Japan Airlines
24 Dec - 18 Jan	Japan Airlines
25 Dec - 10 Jan	Japan Airlines
17 Dec - 28 Dec	Japan Airlines
03 Dec - 07 Dec	Japan Airlines
20 Dec - 03 Jan	Air China
30 Dec - 22 Jan	Japan Airlines
26 Dec - 09 Jan	Japan Airlines
29 Dec - 15 Jan	Japan Airlines

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 $625

Return flights