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

Return flights

10 Dec - 25 Dec	British Airways	direct
03 Dec - 10 Dec	British Airways	direct
10 Dec - 16 Dec	Aer Lingus
07 Dec - 14 Dec	TAP
03 Dec - 08 Dec	TAP
15 Dec - 25 Dec	British Airways	direct
01 Dec - 08 Dec	Iberia	direct
05 Dec - 12 Dec	Iberia	direct
07 Dec - 14 Dec	Iberia	direct
08 Dec - 15 Dec	Iberia	direct
12 Dec - 11 Jan	Finnair	direct
09 Dec - 07 Jan	SWISS
25 Dec - 18 Jan	Iberia
31 Dec - 07 Jan	Iberia	direct
29 Dec - 05 Jan	Iberia
09 Dec - 07 Jan	Iberia	direct
16 Dec - 14 Jan	Iberia
22 Dec - 04 Jan	Finnair	direct
28 Dec - 04 Jan	Iberia	direct
25 Dec - 01 Jan	Iberia

Also check the deals for one-way flights from Boston to Madrid 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 Boston to Madrid in December from 277€

Return flights