AirHint found the following cheapest return flights from Boston (BOS) to Madrid (MAD) in May 2026 (see full year).
Return flights
| 12 May - 26 May | Finnair | direct | |
| 13 May - 29 May | Aer Lingus | ||
| 18 May - 13 Jun | TAP | ||
| 13 May - 29 May | British Airways | direct | |
| 18 May - 13 Jun | British Airways | direct |
Also check the deals for one-way flights from Boston to Madrid in May.
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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