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

Return flights

19 Jan - 30 Jan	Finnair	direct
20 Jan - 28 Jan	Iberia
21 Jan - 28 Jan	Finnair	direct
27 Jan - 03 Feb	Iberia
19 Jan - 28 Jan	Finnair	direct
18 Jan - 27 Jan	Finnair	direct
26 Jan - 04 Feb	Iberia	direct
25 Jan - 03 Feb	Iberia	direct
20 Jan - 04 Feb	Iberia
27 Jan - 04 Feb	Iberia
19 Jan - 16 Feb	Air Canada
19 Jan - 26 Jan	Iberia
21 Jan - 26 Jan	Iberia
16 Jan - 21 Jan	Iberia
19 Jan - 25 Jan	Finnair	direct
23 Jan - 05 Feb	Finnair	direct
30 Jan - 03 Feb	Iberia	direct
28 Jan - 08 Feb	Finnair	direct
20 Jan - 02 Feb	Air France
18 Jan - 25 Jan	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.

Book a cheap hotel in Madrid

Cheap car rent in Madrid

Cheapest return flights from Boston to Madrid in January from $307

Return flights