AirHint found the following cheapest one-way flights from Boston (BOS) to Madrid (MAD) in December 2025 (see full year).
One-Way flights
| 01 Dec | SWISS | ||
| 04 Dec | Icelandair | ||
| 05 Dec | Icelandair | ||
| 09 Dec | TAP | ||
| 07 Dec | TAP | ||
| 03 Dec | TAP | ||
| 08 Dec | KLM | ||
| 12 Dec | Icelandair | ||
| 06 Dec | TAP | ||
| 31 Dec | TAP |
Also check the deals for return flights from Boston to Madrid in December.
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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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