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

Return flights

21 Sep - 07 Oct	Delta
25 Sep - 02 Oct	Iberia
29 Sep - 06 Oct	United
09 Sep - 16 Sep	United
23 Sep - 30 Sep	United
10 Sep - 16 Oct	Delta
24 Sep - 13 Oct	Delta
15 Sep - 22 Sep	United
07 Sep - 14 Sep	Iberia
05 Sep - 12 Sep	United
11 Sep - 18 Sep	United
08 Sep - 27 Sep	United
13 Sep - 20 Sep	United
17 Sep - 24 Sep	Iberia
01 Sep - 13 Oct	Delta
09 Sep - 05 Oct	Delta
21 Sep - 28 Sep	United
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 529€

Return flights