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

Return flights

10 May - 03 Jun	LOT
09 May - 23 May	Etihad Airways
01 May - 15 May	TAP
06 May - 13 May	Finnair
15 May - 22 May	Ryanair
23 May - 31 May	Finnair
31 May - 07 Jun	Air France
10 May - 17 May	Finnair
08 May - 31 May	Finnair
15 May - 17 May	Turkish Airlines
01 May - 16 May	Turkish Airlines
29 May - 05 Jun	Turkish Airlines
17 May - 24 May	Finnair
29 May - 05 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 693€

Return flights