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

Return flights

31 Aug - 08 Sep	Ryanair
20 Aug - 26 Aug	TAP
19 Aug - 23 Aug	Vueling Airlines
28 Aug - 07 Sep	Norwegian Air Sweden AOC
31 Aug - 07 Sep	Ryanair
28 Aug - 04 Sep	Norwegian Air Sweden AOC
19 Aug - 27 Aug	TAP
30 Aug - 08 Sep	TAP
30 Aug - 06 Sep	TAP
25 Aug - 01 Sep	Ryanair
19 Aug - 21 Aug	TAP
15 Aug - 22 Aug	Ryanair
22 Aug - 26 Aug	Ryanair
10 Aug - 14 Aug	Ryanair
12 Aug - 18 Aug	TAP
15 Aug - 21 Aug	Ryanair
18 Aug - 27 Aug	Ryanair
30 Aug - 07 Sep	KLM
28 Aug - 07 Sep	Finnair	direct
30 Aug - 07 Sep	Finnair	direct

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.

Book a cheap hotel in Helsinki

Cheap car rent in Helsinki

Cheapest return flights from Lisbon to Helsinki in August from 223€

Return flights