AirHint found the following cheapest return flights from Biarritz-bayonne (BIQ) to Basel (BSL) in September 2025 (see full year).

Return flights

27 Sep - 15 Oct	easyJet	direct
24 Sep - 15 Oct	easyJet	direct
27 Sep - 08 Oct	easyJet	direct
24 Sep - 08 Oct	easyJet	direct
27 Sep - 01 Oct	easyJet	direct
27 Sep - 11 Oct	easyJet	direct
24 Sep - 01 Oct	easyJet	direct
24 Sep - 11 Oct	easyJet	direct
24 Sep - 27 Sep	easyJet	direct
27 Sep - 18 Oct	easyJet	direct
27 Sep - 04 Oct	easyJet	direct
26 Sep - 29 Sep	Air France
22 Sep - 24 Sep	Air France
26 Sep - 26 Sep	KLM
27 Sep - 27 Sep	easyJet

Also check the deals for one-way flights from Biarritz-bayonne 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 Biarritz-bayonne to Basel in September from 95€

Return flights