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

Return flights

18 Aug - 16 Sep	Air France
24 Aug - 07 Sep	KLM
21 Aug - 02 Sep	Ryanair
12 Aug - 26 Aug	Ryanair
09 Aug - 15 Aug	Ryanair
17 Aug - 28 Aug	Ryanair
24 Aug - 31 Aug	Ryanair
15 Aug - 31 Aug	Ryanair
22 Aug - 24 Aug	Ryanair
18 Aug - 25 Aug	Ryanair
09 Aug - 29 Aug	Ryanair
18 Aug - 27 Aug	Ryanair
10 Aug - 29 Aug	Ryanair

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 833€

Return flights