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

Return flights

09 May - 23 May	Japan Airlines
28 May - 02 Jun	Japan Airlines
27 May - 03 Jun	Japan Airlines
20 May - 27 May	Japan Airlines
27 May - 31 May	Japan Airlines
18 May - 29 May	Japan Airlines
04 May - 18 May	Japan Airlines
13 May - 20 May	Japan Airlines
26 May - 30 May	Japan Airlines
03 May - 17 May	Japan Airlines
01 May - 09 May	Japan Airlines
01 May - 08 May	Japan Airlines
29 May - 05 Jun	Japan Airlines
23 May - 01 Jun	Japan Airlines

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 $1434

Return flights