AirHint found the following cheapest return flights from Frankfurt (FRA) to Basel (BSL) in September 2025 (see full year).

Return flights

09 Sep - 23 Sep	Wizz Air Malta
04 Sep - 08 Sep	Lufthansa	direct
19 Sep - 21 Sep	Air Dolomiti	direct
26 Sep - 28 Sep	Air Dolomiti	direct
12 Sep - 24 Sep	Air Dolomiti	direct
09 Sep - 23 Sep	Air Dolomiti	direct
24 Sep - 28 Sep	Air Dolomiti	direct
05 Sep - 08 Sep	SWISS	direct
11 Sep - 16 Sep	Lufthansa	direct
12 Sep - 14 Sep	Lufthansa	direct

Also check the deals for one-way flights from Frankfurt 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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Cheapest return flights from Frankfurt to Basel in September from $123

Return flights