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

Return flights

19 May - 26 May	Lufthansa
25 May - 31 May	LOT
27 May - 03 Jun	LOT
19 May - 27 May	Lufthansa
19 May - 29 May	LOT
19 May - 30 May	LOT
18 May - 27 May	LOT
18 May - 24 May	LOT
19 May - 02 Jun	LOT
28 May - 06 Jun	LOT
28 May - 08 Jun	LOT
12 May - 18 May	Lufthansa
12 May - 27 May	Lufthansa
06 May - 18 May	Lufthansa
20 May - 03 Jun	LOT
30 May - 07 Jun	LOT
30 May - 06 Jun	LOT
29 May - 07 Jun	Finnair
22 May - 01 Jun	Finnair
23 May - 01 Jun	LOT

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 $747

Return flights