Cheapest return flights from Boston to Madrid in December from $323

AirHint found the following cheapest return flights from Boston (BOS) to Madrid (MAD) in December 2025 (see full year).

Return flights

03 Dec - 10 Dec American Airlines direct
09 Dec - 16 Dec American Airlines direct
01 Dec - 15 Jan British Airways direct
05 Dec - 12 Dec Iberia direct
08 Dec - 15 Dec Iberia direct
03 Dec - 08 Dec British Airways direct
04 Dec - 11 Dec Iberia direct
04 Dec - 25 Dec British Airways direct
11 Dec - 19 Jan Iberia
05 Dec - 08 Dec Iberia direct
06 Dec - 13 Dec Iberia direct
05 Dec - 14 Dec Iberia direct
24 Dec - 17 Jan British Airways
24 Dec - 09 Jan British Airways
28 Dec - 10 Jan Iberia
11 Dec - 08 Jan Iberia
16 Dec - 12 Jan Aer Lingus
26 Dec - 09 Jan Iberia
10 Dec - 07 Jan TAP
11 Dec - 07 Jan TAP

Also check the deals for one-way 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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