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

Return flights

11 May - 25 May	Finnair
09 May - 20 May	LOT
30 May - 08 Jun	LOT
07 May - 12 May	KLM
07 May - 28 May	KLM
09 May - 29 May	Shenzhen Airlines
20 May - 03 Jun	Asiana Airlines
12 May - 21 May	Air France
12 May - 22 May	Air France
19 May - 26 May	LOT
16 May - 24 May	LOT
13 May - 20 May	LOT
30 May - 07 Jun	LOT
26 May - 08 Jun	Finnair
28 May - 10 Jun	Air France
28 May - 04 Jun	Air France
25 May - 01 Jun	Finnair
24 May - 03 Jun	Finnair
27 May - 07 Jun	Finnair
24 May - 02 Jun	Finnair

Also check the deals for one-way flights from Seoul to Lisbon 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 Seoul to Lisbon in May from 610€

Return flights