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

Return flights

29 Sep - 08 Oct	Ryanair
20 Sep - 24 Sep	Ryanair
29 Sep - 02 Oct	Ryanair
22 Sep - 02 Oct	Ryanair
28 Sep - 06 Oct	Ryanair
15 Sep - 24 Sep	Ryanair
20 Sep - 25 Sep	Ryanair
27 Sep - 06 Oct	Ryanair
22 Sep - 13 Oct	Ryanair
20 Sep - 30 Sep	Ryanair
22 Sep - 30 Sep	Ryanair
23 Sep - 29 Sep	Norwegian Air Sweden AOC
27 Sep - 04 Oct	Ryanair
22 Sep - 04 Oct	Ryanair
20 Sep - 23 Sep	Ryanair
29 Sep - 04 Oct	Ryanair
23 Sep - 30 Sep	Ryanair
22 Sep - 29 Sep	Ryanair
24 Sep - 30 Sep	Ryanair
20 Sep - 04 Oct	Ryanair

Also check the deals for one-way flights from Helsinki to Lisbon in September.

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 Lisbon

Cheap car rent in Lisbon

Cheapest return flights from Helsinki to Lisbon in September from 169€

Return flights