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

Return flights

04 Dec - 09 Dec	KLM
20 Dec - 10 Jan	KLM
03 Dec - 08 Dec	KLM
06 Dec - 14 Dec	KLM
05 Dec - 14 Dec	KLM
03 Dec - 10 Dec	Iberia	direct
04 Dec - 11 Dec	Iberia	direct
02 Dec - 09 Dec	Iberia	direct
08 Dec - 15 Dec	Iberia	direct
04 Dec - 09 Dec	Iberia	direct
03 Dec - 08 Dec	Finnair	direct
28 Dec - 07 Jan	British Airways
22 Dec - 03 Jan	British Airways
19 Dec - 01 Jan	British Airways
25 Dec - 01 Jan	Iberia
19 Dec - 04 Jan	British Airways
27 Dec - 04 Jan	Iberia
27 Dec - 02 Jan	British Airways
23 Dec - 03 Jan	British Airways
26 Dec - 02 Jan	Iberia

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 371€

Return flights