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

Return flights

10 Sep - 15 Sep	Air France	direct
09 Sep - 13 Sep	Air France	direct
13 Sep - 15 Sep	Air France	direct
04 Sep - 06 Sep	Air France	direct
04 Sep - 07 Sep	Air France	direct
20 Sep - 24 Sep	easyJet
17 Sep - 24 Sep	easyJet
15 Sep - 22 Sep	Air France	direct
23 Sep - 01 Oct	easyJet
19 Sep - 21 Sep	easyJet
17 Sep - 21 Sep	easyJet

Also check the deals for one-way flights from Paris 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 Paris to Basel in September from 123€

Return flights