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

Return flights

13 Dec - 16 Dec	Iberia
11 Dec - 16 Dec	Air Europa
12 Dec - 16 Dec	Air Europa
04 Dec - 08 Dec	TAP
24 Dec - 01 Jan	TAP
18 Dec - 01 Jan	TAP
01 Dec - 09 Dec	SWISS
02 Dec - 07 Dec	KLM
06 Dec - 16 Dec	KLM
04 Dec - 19 Dec	KLM
18 Dec - 21 Dec	KLM
05 Dec - 14 Dec	KLM
26 Dec - 01 Jan	TAP
26 Dec - 04 Jan	TAP
25 Dec - 06 Jan	TAP
27 Dec - 04 Jan	TAP
22 Dec - 04 Jan	TAP
28 Dec - 06 Jan	KLM
22 Dec - 07 Jan	TAP
21 Dec - 03 Jan	Aer Lingus

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.

Book a cheap hotel in Boston

Cheap car rent in Boston

Cheapest return flights from Madrid to Boston in December from $411

Return flights