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

Return flights

10 May - 19 May	LOT
07 May - 14 May	Finnair
11 May - 18 May	Finnair
30 May - 13 Jun	LOT
15 May - 28 May	Finnair
16 May - 30 May	Etihad Airways
11 May - 22 May	Lufthansa
08 May - 15 May	Finnair
17 May - 24 May	Finnair
15 May - 24 May	Finnair
01 May - 15 May	Finnair
31 May - 14 Jun	Turkish Airlines
31 May - 14 Jun	Korean Air	direct

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 692€

Return flights