AirHint found the following cheapest return flights from Lisbon (LIS) to Seoul (ICN) in May 2026 (see full year).

Return flights

31 May - 10 Jun	LOT
20 May - 31 May	Finnair
07 May - 25 May	Etihad Airways
19 May - 30 May	KLM
07 May - 14 May	Finnair
11 May - 18 May	Finnair
06 May - 17 May	Finnair
06 May - 24 May	Finnair
07 May - 23 May	Etihad Airways
07 May - 24 May	Finnair
11 May - 22 May	Finnair
30 May - 13 Jun	LOT
29 May - 13 Jun	LOT
31 May - 14 Jun	Turkish Airlines

Also check the deals for one-way flights from Lisbon to Seoul in May.

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 May from $813

Return flights