AirHint found the following cheapest one-way flights from Houston (IAH) to Madrid (MAD) in September 2026 (see full year).
One-Way flights
| 15 Sep | British Airways | ||
| 16 Sep | British Airways | ||
| 09 Sep | Air France | ||
| 30 Sep | KLM | ||
| 17 Sep | Air France |
Also check the deals for return flights from Houston to Madrid in September.
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