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

Return flights

30 Sep - 07 Oct	Ryanair
03 Sep - 09 Sep	Ryanair
23 Sep - 30 Sep	Ryanair
06 Sep - 09 Sep	Ryanair
20 Sep - 23 Sep	easyJet	direct
26 Sep - 30 Sep	Ryanair
23 Sep - 27 Sep	Ryanair
02 Sep - 06 Sep	Ryanair
30 Sep - 04 Oct	Ryanair
30 Sep - 07 Oct	easyJet	direct
23 Sep - 30 Sep	easyJet	direct
30 Sep - 04 Oct	easyJet	direct
06 Sep - 09 Sep	easyJet	direct
02 Sep - 06 Sep	easyJet	direct

Also check the deals for one-way flights from Thessaloniki 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 Thessaloniki to Basel in September from $128

Return flights