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

Return flights

16 Sep - 23 Sep	Pegasus Airlines
18 Sep - 23 Sep	Pegasus Airlines
18 Sep - 21 Sep	Pegasus Airlines
16 Sep - 23 Sep	Pegasus Airlines	direct
18 Sep - 23 Sep	AJet	direct
17 Sep - 24 Sep	AJet	direct
19 Sep - 22 Sep	Pegasus Airlines
15 Sep - 23 Sep	Pegasus Airlines
19 Sep - 24 Sep	AJet	direct
22 Sep - 25 Sep	Pegasus Airlines
26 Sep - 05 Oct	AJet
28 Sep - 05 Oct	Pegasus Airlines
26 Sep - 05 Oct	Pegasus Airlines	direct
28 Sep - 05 Oct	Pegasus Airlines	direct

Also check the deals for one-way flights from Istanbul 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 Istanbul to Basel in September from 131€

Return flights