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

Return flights

28 Aug - 04 Sep	Norwegian Air Sweden AOC
13 Aug - 21 Aug	Lufthansa
08 Aug - 12 Aug	Lufthansa
06 Aug - 20 Aug	Lufthansa
13 Aug - 20 Aug	Lufthansa
05 Aug - 20 Aug	Lufthansa
05 Aug - 12 Aug	Lufthansa
12 Aug - 20 Aug	Lufthansa
07 Aug - 12 Aug	Lufthansa
20 Aug - 27 Aug	Lufthansa
11 Aug - 19 Aug	Ryanair
28 Aug - 03 Sep	Lufthansa
29 Aug - 03 Sep	Ryanair
29 Aug - 02 Sep	Ryanair
28 Aug - 03 Sep	Finnair	direct
28 Aug - 04 Sep	Finnair	direct
31 Aug - 03 Sep	airBaltic
25 Aug - 01 Sep	Finnair	direct
29 Aug - 03 Sep	Finnair	direct

Also check the deals for one-way flights from Helsinki to Lisbon 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 Lisbon in August from 218€

Return flights