AirHint found the following cheapest return flights from Houston (IAH) to Madrid (MAD) in May 2026 (see full year).

Return flights

06 May - 12 May	ITA Airways
06 May - 13 May	ITA Airways
03 May - 15 May	Finnair
18 May - 28 May	Finnair
18 May - 27 May	Finnair
18 May - 29 May	Finnair
17 May - 28 May	Finnair
17 May - 27 May	Finnair
01 May - 11 May	British Airways
11 May - 31 May	Air Canada
25 May - 09 Jun	British Airways
25 May - 03 Jun	British Airways
25 May - 08 Jun	British Airways
24 May - 15 Jun	ITA Airways
27 May - 03 Jun	Iberia
25 May - 16 Jun	British Airways

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

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 May from $474

Return flights