AirHint found the following cheapest one-way flights from Chicago (ORD) to Madrid (MAD) in September 2026 (see full year).
One-Way flights
| 27 Sep | Aer Lingus | ||
| 13 Sep | ITA Airways | ||
| 08 Sep | Spirit Airlines | ||
| 07 Sep | Aer Lingus | ||
| 06 Sep | Aer Lingus | ||
| 09 Sep | Spirit Airlines | ||
| 05 Sep | Air Serbia | ||
| 08 Sep | Iberia | direct | |
| 07 Sep | Iberia | direct | |
| 09 Sep | Iberia | direct |
Also check the deals for return flights from Chicago to Madrid in September.
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