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

Return flights

18 Aug - 03 Sep	Air Canada
11 Aug - 27 Aug	Air Canada
18 Aug - 26 Aug	Air Canada
04 Aug - 22 Aug	Air Canada
03 Aug - 02 Sep	United
13 Aug - 20 Aug	United
01 Aug - 02 Sep	Air Canada
08 Aug - 20 Aug	United
15 Aug - 22 Aug	Iberia
21 Aug - 02 Sep	United
21 Aug - 28 Aug	United
15 Aug - 24 Aug	Frontier Airlines
02 Aug - 24 Aug	United
06 Aug - 13 Aug	United
28 Aug - 10 Sep	United
21 Aug - 03 Sep	Spirit Airlines
29 Aug - 06 Sep	Spirit Airlines
30 Aug - 06 Sep	United

Also check the deals for one-way flights from Houston to Madrid in August.

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 August from 421€

Return flights