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

Return flights

04 Dec - 10 Dec	Air France
03 Dec - 08 Dec	Air France
03 Dec - 10 Dec	Air France
03 Dec - 12 Dec	Air France
15 Dec - 30 Dec	Air France
16 Dec - 30 Dec	Air France
02 Dec - 12 Dec	Air France
14 Dec - 14 Jan	KLM
08 Dec - 16 Dec	Air France
04 Dec - 12 Dec	Air France
02 Dec - 07 Dec	Air France
15 Dec - 15 Jan	Air France
02 Dec - 20 Jan	Air France
03 Dec - 21 Jan	Air France
29 Dec - 12 Jan	Air France
29 Dec - 28 Jan	Air France
26 Dec - 01 Jan	Air France
26 Dec - 16 Jan	Air France
26 Dec - 11 Jan	Air France
19 Dec - 07 Jan	Air China

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 507€

Return flights