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

Return flights

01 Dec - 08 Dec	Iberia
02 Dec - 07 Dec	Iberia
15 Dec - 29 Dec	Iberia
30 Dec - 18 Jan	Iberia
29 Dec - 17 Jan	Iberia
15 Dec - 28 Dec	Iberia
31 Dec - 07 Jan	Finnair
14 Dec - 28 Dec	Iberia
28 Dec - 11 Jan	Finnair
21 Dec - 11 Jan	Finnair
31 Dec - 04 Jan	Finnair
19 Dec - 04 Jan	Finnair
30 Dec - 06 Jan	Finnair
28 Dec - 16 Jan	Finnair
28 Dec - 05 Jan	Finnair
13 Dec - 20 Dec	Finnair
19 Dec - 29 Dec	Finnair
05 Dec - 13 Dec	Finnair
14 Dec - 28 Dec	Korean Air	direct

Also check the deals for one-way flights from Lisbon to Seoul 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 Lisbon to Seoul in December from 634€

Return flights