AirHint found the following cheapest one-way flights from Boston (BOS) to Madrid (MAD) in September 2026 (see full year).
One-Way flights
| 09 Sep | SWISS | ||
| 13 Sep | Air France | ||
| 17 Sep | Air France | ||
| 22 Sep | Icelandair | ||
| 11 Sep | KLM | ||
| 27 Sep | Icelandair | ||
| 12 Sep | KLM | ||
| 10 Sep | Austrian Airlines | ||
| 16 Sep | Icelandair | ||
| 22 Sep | jetBlue | direct |
Also check the deals for return flights from Boston to Madrid in September.
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