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

Return flights

21 Dec - 31 Dec	Air China
29 Dec - 13 Jan	Air China
26 Dec - 04 Jan	Air China
20 Dec - 06 Jan	Air China
24 Dec - 03 Jan	Air China
25 Dec - 03 Jan	Air China
23 Dec - 13 Jan	Japan Airlines
03 Dec - 07 Dec	Japan Airlines
24 Dec - 14 Jan	Japan Airlines
23 Dec - 16 Jan	Japan Airlines
24 Dec - 16 Jan	Japan Airlines
31 Dec - 07 Jan	Japan Airlines
02 Dec - 07 Dec	Japan Airlines
15 Dec - 25 Dec	Japan Airlines
24 Dec - 31 Dec	Japan Airlines
22 Dec - 30 Dec	Japan Airlines
27 Dec - 31 Dec	Japan Airlines
04 Dec - 08 Dec	Japan Airlines
03 Dec - 08 Dec	Japan Airlines
15 Dec - 18 Dec	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 452€

Return flights