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

Return flights

30 Sep - 07 Oct	United
22 Sep - 29 Sep	Iberia
28 Sep - 05 Oct	Iberia
18 Sep - 25 Sep	United
26 Sep - 03 Oct	United
27 Sep - 05 Oct	Iberia
16 Sep - 23 Sep	United
24 Sep - 01 Oct	Iberia
20 Sep - 27 Sep	United
10 Sep - 16 Oct	Delta
13 Sep - 20 Sep	Spirit Airlines
05 Sep - 11 Sep	Spirit Airlines
08 Sep - 27 Sep	Air Canada
12 Sep - 15 Sep	United
10 Sep - 17 Sep	United
14 Sep - 21 Sep	United
09 Sep - 05 Oct	Delta
01 Sep - 13 Oct	Spirit Airlines
10 Sep - 19 Oct	Spirit Airlines

Also check the deals for one-way flights from San Antonio 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 San Antonio to Madrid in September from $616

Return flights