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

Return flights

19 Dec - 10 Jan	Air China
25 Dec - 01 Jan	Air China
05 Dec - 14 Dec	Air China
02 Dec - 09 Dec	Air China
10 Dec - 16 Dec	Air China
04 Dec - 11 Dec	Air China
10 Dec - 15 Dec	LOT
28 Dec - 10 Jan	Etihad Airways
30 Dec - 06 Jan	Etihad Airways
29 Dec - 07 Jan	LOT
30 Dec - 10 Jan	Etihad Airways
01 Dec - 15 Dec	LOT
01 Dec - 06 Dec	LOT
09 Dec - 15 Dec	LOT
10 Dec - 31 Dec	LOT
09 Dec - 13 Dec	LOT
29 Dec - 30 Jan	LOT
10 Dec - 30 Jan	LOT
10 Dec - 18 Jan	LOT
10 Dec - 19 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 435€

Return flights