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

Return flights

13 May - 21 May	Air France
14 May - 21 May	Air France
26 May - 02 Jun	LOT
11 May - 20 May	KLM
11 May - 21 May	KLM
06 May - 20 May	KLM
13 May - 17 May	Air France
13 May - 10 Jun	Air France
25 May - 01 Jun	LOT
25 May - 03 Jun	KLM
12 May - 19 May	Air France
12 May - 20 May	Air France
06 May - 24 May	KLM
13 May - 27 May	Air France
30 May - 06 Jun	LOT
28 May - 06 Jun	LOT
29 May - 07 Jun	Finnair
31 May - 07 Jun	Finnair
24 May - 07 Jun	Finnair
26 May - 04 Jun	Air France

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 599€

Return flights