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

Return flights

07 Dec - 11 Dec	KLM
05 Dec - 13 Dec	Air France
07 Dec - 14 Dec	KLM
07 Dec - 12 Dec	KLM
08 Dec - 13 Dec	Air France
03 Dec - 08 Dec	Air France
05 Dec - 10 Dec	Air France
03 Dec - 09 Dec	Air France
14 Dec - 08 Jan	KLM
17 Dec - 11 Jan	Air France
01 Dec - 08 Dec	Air France
04 Dec - 13 Dec	Air France
09 Dec - 06 Jan	Air France
10 Dec - 07 Jan	Air France
25 Dec - 06 Jan	KLM
25 Dec - 04 Jan	KLM
30 Dec - 07 Jan	KLM
16 Dec - 07 Jan	Air France
30 Dec - 06 Jan	KLM
29 Dec - 08 Jan	Lufthansa

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 500€

Return flights