AirHint found the following cheapest return flights from Stockholm (ARN) to Helsinki (HEL) in September 2026 (see full year).
Return flights
| 04 Sep - 12 Sep | Norwegian Air Sweden AOC | direct | |
| 07 Sep - 12 Sep | Norwegian Air Sweden AOC | direct | |
| 06 Sep - 12 Sep | Norwegian Air Sweden AOC | direct | |
| 04 Sep - 04 Sep | Norwegian Air Sweden AOC | direct |
Also check the deals for one-way flights from Stockholm to Helsinki in September.
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