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

Return flights

04 Aug - 20 Sep	T'way Air
04 Aug - 21 Sep	T'way Air
22 Aug - 21 Sep	China Eastern
26 Aug - 30 Aug	KLM
17 Aug - 24 Aug	KLM
23 Aug - 30 Aug	KLM
03 Aug - 06 Aug	Turkish Airlines
11 Aug - 15 Aug	KLM
09 Aug - 17 Aug	Lufthansa
08 Aug - 14 Aug	Lufthansa

Also check the deals for one-way flights from Osaka to Porto 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 Osaka to Porto in August from 955€

Return flights