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

Return flights

30 Jul - 04 Aug	Ryanair
19 Jul - 29 Jul	Norwegian Air Sweden AOC
12 Jul - 28 Jul	Ryanair
20 Jul - 08 Aug	Ryanair
18 Jul - 28 Jul	Ryanair
31 Jul - 03 Aug	Ryanair
12 Jul - 19 Jul	Ryanair
11 Jul - 18 Jul	Norwegian
11 Jul - 13 Jul	Ryanair

Also check the deals for one-way flights from Porto to Helsinki in July.

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 Helsinki in July from $412

Return flights