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

Return flights

08 Dec - 14 Dec	Air China
06 Dec - 15 Dec	KLM
11 Dec - 15 Dec	KLM
06 Dec - 09 Dec	Air France
02 Dec - 10 Dec	Air France
04 Dec - 09 Dec	Air France
06 Dec - 10 Dec	Air France
06 Dec - 12 Dec	Air France
03 Dec - 15 Dec	Air France
04 Dec - 08 Dec	Air France
16 Dec - 07 Jan	Air France
28 Dec - 08 Jan	KLM
28 Dec - 14 Jan	KLM
28 Dec - 09 Jan	KLM
28 Dec - 07 Jan	KLM
28 Dec - 01 Jan	KLM
28 Dec - 13 Jan	KLM
17 Dec - 01 Jan	Air France
30 Dec - 16 Jan	LOT
24 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 $573

Return flights