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

Return flights

28 Sep - 14 Oct	Ryanair
25 Sep - 14 Oct	Ryanair
28 Sep - 15 Oct	Ryanair
07 Sep - 14 Sep	Ryanair
25 Sep - 15 Oct	Ryanair
28 Sep - 16 Oct	Ryanair
07 Sep - 12 Sep	Ryanair
10 Sep - 16 Sep	Ryanair
26 Sep - 15 Oct	Ryanair
02 Sep - 17 Sep	Ryanair
02 Sep - 09 Sep	Ryanair
26 Sep - 14 Oct	Ryanair
18 Sep - 20 Sep	Ryanair
06 Sep - 12 Sep	easyJet
11 Sep - 22 Sep	Ryanair
01 Sep - 18 Sep	transavia
27 Sep - 14 Oct	Air Europa
28 Sep - 17 Oct	Ryanair
28 Sep - 18 Oct	Ryanair
15 Sep - 26 Sep	Wizz Air Malta

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 693€

Return flights