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

Return flights

05 Aug - 13 Aug	Norwegian Air Sweden AOC
16 Aug - 30 Aug	Norwegian Air Sweden AOC
27 Aug - 31 Aug	Scandinavian Airlines
14 Aug - 23 Aug	KLM
14 Aug - 21 Aug	Norwegian Air Sweden AOC
13 Aug - 17 Aug	Scandinavian Airlines
16 Aug - 22 Aug	Lufthansa
07 Aug - 11 Aug	Norwegian Air Sweden AOC
18 Aug - 26 Aug	Ryanair
04 Aug - 11 Aug	Norwegian Air Sweden AOC

Also check the deals for one-way flights from Helsinki 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 Helsinki to Porto in August from $262

Return flights