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

Return flights

24 Jul - 07 Aug	Norwegian Air Sweden AOC
21 Jul - 25 Jul	Ryanair
22 Jul - 29 Jul	KLM
25 Jul - 28 Jul	Ryanair
22 Jul - 31 Jul	KLM
21 Jul - 24 Jul	Ryanair
16 Jul - 28 Jul	Norwegian Air Sweden AOC
24 Jul - 08 Aug	Norwegian Air Sweden AOC
14 Jul - 25 Jul	Ryanair
12 Jul - 04 Aug	Ryanair
28 Jul - 04 Aug	Ryanair
07 Jul - 10 Jul	Ryanair
17 Jul - 22 Jul	KLM
17 Jul - 20 Jul	KLM
28 Jul - 01 Aug	Ryanair
21 Jul - 01 Aug	Ryanair
22 Jul - 01 Aug	KLM
19 Jul - 04 Aug	KLM
27 Jul - 03 Aug	Norwegian Air Sweden AOC
05 Jul - 02 Aug	KLM

Also check the deals for one-way flights from Helsinki to Porto 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 Helsinki to Porto in July from $316

Return flights