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

One-Way flights

23 Aug	Norwegian Air Sweden AOC
27 Aug	Ryanair
28 Aug	Ryanair
06 Aug	Ryanair
30 Aug	Norwegian Air Sweden AOC
13 Aug	Ryanair
12 Aug	Vueling Airlines
31 Aug	Ryanair
05 Aug	Vueling Airlines
20 Aug	Norwegian Air Sweden AOC

Also check the deals for return flights from Porto to Helsinki 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 Porto to Helsinki in August from 115€

One-Way flights