AirHint found the following cheapest return flights from Boston (BOS) to Madrid (MAD) in January 2026 (see full year).

Return flights

21 Jan - 28 Jan	Finnair	direct
19 Jan - 30 Jan	Iberia
27 Jan - 03 Feb	Iberia
19 Jan - 30 Jan	Finnair	direct
18 Jan - 27 Jan	Finnair	direct
20 Jan - 28 Jan	British Airways
21 Jan - 26 Jan	Iberia
19 Jan - 26 Jan	Iberia
20 Jan - 25 Jan	Iberia
28 Jan - 08 Feb	Finnair	direct
30 Jan - 03 Feb	Finnair	direct
19 Jan - 16 Feb	Iberia
18 Jan - 25 Jan	Iberia	direct
29 Jan - 02 Feb	TAP
19 Jan - 16 Feb	Finnair	direct
15 Jan - 21 Jan	American Airlines
30 Jan - 02 Feb	Iberia
29 Jan - 02 Feb	Iberia	direct
30 Jan - 02 Feb	Aer Lingus	direct
29 Jan - 01 Feb	Iberia	direct

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

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 January from $307

Return flights