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

Return flights

25 Sep - 02 Oct	easyJet	direct
19 Sep - 23 Sep	easyJet	direct
25 Sep - 01 Oct	easyJet
19 Sep - 21 Sep	easyJet	direct
18 Sep - 25 Sep	easyJet
18 Sep - 25 Sep	easyJet	direct
25 Sep - 01 Oct	easyJet	direct
03 Sep - 06 Sep	easyJet	direct
07 Sep - 15 Sep	Vueling Airlines
07 Sep - 08 Sep	Vueling Airlines
07 Sep - 11 Sep	Vueling Airlines
14 Sep - 29 Sep	Vueling Airlines
14 Sep - 02 Oct	Vueling Airlines
14 Sep - 15 Sep	Vueling Airlines

Also check the deals for one-way flights from Split 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 Split to Basel in September from $109

Return flights