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

Return flights

23 Sep - 26 Sep	easyJet
23 Sep - 27 Sep	Austrian Airlines
24 Sep - 27 Sep	Austrian Airlines
13 Sep - 16 Sep	Austrian Airlines
18 Sep - 21 Sep	Austrian Airlines
19 Sep - 21 Sep	Austrian Airlines
12 Sep - 19 Sep	Austrian Airlines
11 Sep - 18 Sep	Austrian Airlines
25 Sep - 02 Oct	Austrian Airlines
13 Sep - 15 Sep	Austrian Airlines
12 Sep - 14 Sep	Austrian Airlines

Also check the deals for one-way flights from Innsbruck to Madrid 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 Innsbruck to Madrid in September from $403

Return flights