Cheapest return OPO–ICN flights, September

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

Return flights

01 Sep - 05 Sep Ryanair
22 Sep - 06 Oct Air Europa
13 Sep - 19 Sep Ryanair
17 Sep - 29 Sep Lufthansa
03 Sep - 23 Sep Turkish Airlines
07 Sep - 20 Sep Turkish Airlines
05 Sep - 16 Sep Qatar Airways
06 Sep - 16 Sep Ryanair
07 Sep - 16 Sep Turkish Airlines
11 Sep - 16 Sep Turkish Airlines
03 Sep - 22 Sep Lufthansa

Also check the deals for one-way flights from Porto to Seoul in September.

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