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

Return flights

29 Aug - 08 Sep	Ryanair
31 Aug - 08 Sep	Ryanair
29 Aug - 01 Sep	Ryanair
30 Aug - 08 Sep	Norwegian
30 Aug - 04 Sep	Norwegian
30 Aug - 02 Sep	Norwegian
23 Aug - 26 Aug	Lufthansa
15 Aug - 26 Aug	Lufthansa
30 Aug - 06 Sep	Norwegian
28 Aug - 07 Sep	Ryanair
31 Aug - 06 Sep	Ryanair
18 Aug - 27 Aug	Lufthansa
27 Aug - 03 Sep	Vueling Airlines
20 Aug - 26 Aug	Lufthansa
24 Aug - 28 Aug	Ryanair
18 Aug - 21 Aug	Lufthansa
28 Aug - 31 Aug	Vueling Airlines
24 Aug - 31 Aug	Ryanair
22 Aug - 26 Aug	Lufthansa
17 Aug - 31 Aug	Ryanair

Also check the deals for one-way flights from Lisbon 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 return flights from Lisbon to Helsinki in August from 254€

Return flights