AirHint found the following cheapest return flights from Porto (OPO) to Seoul (ICN) in September 2025 (see full year).

Return flights

15 Sep - 23 Sep	Ryanair
28 Sep - 14 Oct	Ryanair
15 Sep - 17 Sep	Ryanair
04 Sep - 18 Sep	Ryanair
09 Sep - 23 Sep	Vueling Airlines
01 Sep - 06 Sep	TAP
21 Sep - 24 Sep	TAP
25 Sep - 09 Oct	easyJet
19 Sep - 26 Sep	Ryanair
05 Sep - 19 Sep	Ryanair
06 Sep - 15 Sep	Vueling Airlines
02 Sep - 17 Sep	Vueling Airlines
24 Sep - 03 Oct	Ryanair

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

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 Porto to Seoul in September from 665€

Return flights