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

Return flights

03 May - 20 May	Japan Airlines
24 May - 07 Jun	Japan Airlines
17 May - 26 May	Japan Airlines
13 May - 24 May	Japan Airlines
01 May - 13 May	Japan Airlines
11 May - 23 May	Japan Airlines
11 May - 22 May	Japan Airlines
10 May - 17 May	Japan Airlines
10 May - 22 May	Japan Airlines
12 May - 31 May	Japan Airlines
10 May - 29 May	Japan Airlines
30 May - 08 Jun	Japan Airlines
31 May - 07 Jun	Japan Airlines
22 May - 02 Jun	Japan Airlines
21 May - 06 Jun	Japan Airlines
22 May - 06 Jun	Japan Airlines
23 May - 06 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 $1721

Return flights