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

One-Way flights

05 Aug	Norwegian Air Sweden AOC
19 Aug	Norwegian Air Sweden AOC
07 Aug	Norwegian Air Sweden AOC
14 Aug	Norwegian Air Sweden AOC
13 Aug	Scandinavian Airlines
01 Aug	Norwegian Air Sweden AOC
26 Aug	Norwegian Air Sweden AOC
12 Aug	Norwegian Air Sweden AOC
27 Aug	Scandinavian Airlines
18 Aug	Ryanair

Also check the deals for return 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 one-way flights from Helsinki to Porto in August from $82

One-Way flights