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

Return flights

24 Sep - 30 Sep	easyJet	direct
15 Sep - 17 Sep	Ryanair
30 Sep - 06 Oct	easyJet
30 Sep - 06 Oct	easyJet	direct
30 Sep - 05 Oct	easyJet	direct
18 Sep - 23 Sep	Ryanair
17 Sep - 23 Sep	easyJet
11 Sep - 14 Sep	Wizz Air Malta
22 Sep - 28 Sep	Iberia
17 Sep - 22 Sep	easyJet
10 Sep - 16 Sep	Wizz Air
09 Sep - 23 Sep	Wizz Air
09 Sep - 14 Sep	Wizz Air
25 Sep - 03 Oct	Air Europa
28 Sep - 03 Oct	Iberia
28 Sep - 05 Oct	Iberia
28 Sep - 01 Oct	Iberia
28 Sep - 01 Oct	easyJet	direct
28 Sep - 05 Oct	easyJet	direct
25 Sep - 03 Oct	easyJet	direct

Also check the deals for one-way flights from Madrid 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 Madrid to Basel in September from 102€

Return flights