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

Return flights

19 May - 26 May	Lufthansa
19 May - 27 May	Lufthansa
19 May - 03 Jun	Lufthansa
06 May - 12 May	Lufthansa
13 May - 20 May	Lufthansa
27 May - 05 Jun	LOT
13 May - 27 May	Lufthansa
12 May - 19 May	Lufthansa
05 May - 12 May	Lufthansa
12 May - 20 May	Lufthansa
20 May - 27 May	Lufthansa
25 May - 01 Jun	Air France
31 May - 08 Jun	LOT
27 May - 03 Jun	Lufthansa
27 May - 04 Jun	Lufthansa
11 May - 19 May	Lufthansa
25 May - 08 Jun	Lufthansa
22 May - 02 Jun	Lufthansa
29 May - 05 Jun	Lufthansa
22 May - 06 Jun	Etihad Airways

Also check the deals for one-way flights from Seoul to Porto 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 Porto in May from $706

Return flights