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

Return flights

21 Dec - 29 Dec	Japan Airlines
02 Dec - 08 Dec	Japan Airlines
08 Dec - 15 Dec	Japan Airlines
18 Dec - 27 Dec	Japan Airlines
01 Dec - 06 Dec	Japan Airlines
08 Dec - 11 Dec	Japan Airlines
03 Dec - 11 Dec	Japan Airlines
31 Dec - 07 Jan	Japan Airlines
22 Dec - 07 Jan	Japan Airlines
21 Dec - 03 Jan	Japan Airlines
09 Dec - 20 Dec	Japan Airlines
17 Dec - 27 Dec	Japan Airlines
13 Dec - 20 Dec	Japan Airlines
24 Dec - 09 Jan	Japan Airlines
17 Dec - 16 Jan	Japan Airlines
21 Dec - 11 Jan	Japan Airlines
30 Dec - 06 Jan	Japan Airlines
20 Dec - 05 Jan	Japan Airlines
26 Dec - 07 Jan	Japan Airlines
20 Dec - 10 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 $1407

Return flights