AirHint found the following cheapest return flights from Basel (BSL) to Amsterdam (AMS) in September 2026 (see full year).
Return flights
| 19 Sep - 20 Sep | KLM | direct | |
| 17 Sep - 27 Sep | KLM | direct | |
| 10 Sep - 13 Sep | KLM | direct |
Also check the deals for one-way flights from Basel to Amsterdam in September.
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