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

Return flights

31 Aug - 14 Sep	Ryanair
28 Aug - 11 Sep	Ryanair
29 Aug - 11 Sep	Ryanair
31 Aug - 13 Sep	Ryanair
04 Aug - 11 Aug	Ryanair
30 Aug - 13 Sep	Ryanair
13 Aug - 18 Aug	Ryanair
12 Aug - 18 Aug	Ryanair
12 Aug - 17 Aug	Ryanair
03 Aug - 05 Aug	easyJet
21 Aug - 28 Aug	Ryanair
17 Aug - 28 Aug	Ryanair
18 Aug - 16 Sep	KLM
02 Aug - 09 Aug	KLM

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

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 August from $888

Return flights