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

Return flights

14 Jan - 21 Jan	Iberia	direct
20 Jan - 27 Jan	Iberia	direct
28 Jan - 04 Feb	Iberia	direct
27 Jan - 03 Feb	Iberia	direct
13 Jan - 20 Jan	Iberia
07 Jan - 14 Jan	Iberia	direct
15 Jan - 22 Jan	Iberia	direct
18 Jan - 25 Jan	Iberia	direct
19 Jan - 26 Jan	Iberia	direct
23 Jan - 30 Jan	Iberia	direct
16 Jan - 23 Jan	Iberia	direct
25 Jan - 01 Feb	Iberia	direct
26 Jan - 02 Feb	Iberia	direct
30 Jan - 06 Feb	Iberia	direct
31 Jan - 07 Feb	TAP
29 Jan - 05 Feb	Iberia
22 Jan - 29 Jan	Iberia
30 Jan - 02 Feb	Iberia	direct
31 Jan - 07 Feb	British Airways	direct
29 Jan - 01 Feb	Iberia

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 $323

Return flights