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

Return flights

05 Dec - 11 Dec	Etihad Airways
01 Dec - 11 Dec	Etihad Airways
29 Dec - 22 Jan	Etihad Airways
01 Dec - 05 Dec	Etihad Airways
29 Dec - 20 Jan	Etihad Airways
08 Dec - 15 Dec	Air China
07 Dec - 13 Dec	LOT
06 Dec - 08 Dec	LOT
06 Dec - 10 Dec	LOT
06 Dec - 13 Dec	LOT
29 Dec - 21 Jan	LOT
16 Dec - 29 Dec	Air France
13 Dec - 29 Dec	Air France
11 Dec - 26 Jan	Air France
14 Dec - 07 Jan	KLM
16 Dec - 06 Jan	Air France
16 Dec - 07 Jan	Air France
27 Dec - 06 Jan	KLM
27 Dec - 07 Jan	KLM
31 Dec - 07 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 456€

Return flights