AirHint found the following cheapest one-way flights from Chicago (ORD) to Madrid (MAD) in September 2026 (see full year).
One-Way flights
| 09 Sep | TAP | ||
| 10 Sep | TAP | ||
| 08 Sep | SWISS | ||
| 09 Sep | British Airways | direct | |
| 08 Sep | British Airways | direct | |
| 10 Sep | British Airways | direct |
Also check the deals for return flights from Chicago to Madrid in September.
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