AirHint found the following cheapest return flights from Helsinki (HEL) to Basel (BSL) in September 2025 (see full year).
Return flights
| 01 Sep - 04 Sep | Norwegian Air Sweden AOC | ||
| 11 Sep - 17 Sep | KLM | ||
| 04 Sep - 10 Sep | KLM | ||
| 01 Sep - 05 Sep | KLM |
Also check the deals for one-way flights from Helsinki to Basel 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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