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

Return flights

23 Sep - 07 Oct	Spirit Airlines
22 Sep - 07 Oct	United
23 Sep - 30 Sep	Air Canada
28 Sep - 07 Oct	Air Canada
21 Sep - 07 Oct	Air Canada
24 Sep - 03 Oct	Spirit Airlines
17 Sep - 23 Sep	Brussels Airlines
21 Sep - 30 Sep	Air Canada
20 Sep - 03 Oct	United
27 Sep - 07 Oct	United
26 Sep - 03 Oct	United
10 Sep - 17 Sep	Iberia
10 Sep - 18 Sep	American Airlines
25 Sep - 10 Oct	Air Canada
15 Sep - 22 Sep	Air Canada
20 Sep - 28 Sep	Spirit Airlines
24 Sep - 05 Oct	Spirit Airlines
21 Sep - 27 Sep	Spirit Airlines
13 Sep - 26 Sep	American Airlines
22 Sep - 29 Sep	United

Also check the deals for one-way flights from Houston 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 Houston to Madrid in September from $521

Return flights