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

Return flights

08 Dec - 14 Dec	Iberia
05 Dec - 09 Dec	Iberia
15 Dec - 23 Dec	Iberia
04 Dec - 08 Dec	Iberia Express
03 Dec - 08 Dec	Iberia Express
04 Dec - 06 Dec	Iberia
26 Dec - 30 Dec	TAP
25 Dec - 30 Dec	Iberia Express
10 Dec - 13 Dec	TAP
15 Dec - 29 Dec	Iberia
29 Dec - 11 Jan	Iberia
31 Dec - 07 Jan	Iberia
22 Dec - 01 Jan	Iberia
25 Dec - 01 Jan	Iberia
29 Dec - 05 Jan	Iberia
27 Dec - 03 Jan	TAP
26 Dec - 02 Jan	TAP
20 Dec - 03 Jan	Iberia
26 Dec - 03 Jan	TAP
24 Dec - 04 Jan	TAP

Also check the deals for one-way flights from Madrid to Boston in December.

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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Cheapest return flights from Madrid to Boston in December from 281€

Return flights