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

Return flights

01 Sep - 18 Sep	Ryanair
12 Sep - 19 Sep	Ryanair
24 Sep - 01 Oct	Ryanair
01 Sep - 14 Sep	Ryanair
05 Sep - 19 Sep	Ryanair
02 Sep - 16 Sep	Ryanair
15 Sep - 23 Sep	Air Europa
15 Sep - 22 Sep	Air Europa
02 Sep - 17 Sep	Ryanair
01 Sep - 19 Sep	Ryanair
08 Sep - 15 Sep	Ryanair
24 Sep - 09 Oct	KLM
25 Sep - 09 Oct	easyJet
15 Sep - 03 Oct	Air Europa
01 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 706€

Return flights