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

Return flights

21 Sep - 25 Sep	Ryanair
16 Sep - 23 Sep	Ryanair
29 Sep - 06 Oct	Ryanair
23 Sep - 30 Sep	Ryanair
08 Sep - 18 Sep	Ryanair
16 Sep - 22 Sep	Ryanair
08 Sep - 22 Sep	Ryanair
16 Sep - 19 Sep	Ryanair
15 Sep - 22 Sep	Ryanair
19 Sep - 26 Sep	Ryanair
22 Sep - 28 Sep	Ryanair
20 Sep - 04 Oct	Ryanair
30 Sep - 05 Oct	Ryanair
26 Sep - 04 Oct	airBaltic

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.

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Cheapest return flights from Helsinki to Lisbon in September from 185€

Return flights