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

Return flights

01 Dec - 13 Dec	easyJet
01 Dec - 07 Dec	easyJet
05 Dec - 12 Dec	easyJet
04 Dec - 11 Dec	Wizz Air Malta
07 Dec - 14 Dec	LOT
06 Dec - 22 Dec	Ryanair
05 Dec - 21 Dec	Ryanair
16 Dec - 23 Dec	Iberia
15 Dec - 22 Dec	Iberia
14 Dec - 21 Dec	Air Europa
31 Dec - 29 Jan	KLM
28 Dec - 07 Jan	Finnair
24 Dec - 04 Jan	Finnair
25 Dec - 06 Jan	Finnair
27 Dec - 06 Jan	Finnair
30 Dec - 01 Jan	Turkish Airlines
27 Dec - 17 Jan	Finnair
28 Dec - 05 Jan	Finnair
28 Dec - 04 Jan	Finnair
26 Dec - 06 Jan	Finnair

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 $618

Return flights