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

Return flights

07 May - 21 May	Iberia	direct
21 May - 25 May	British Airways	direct
20 May - 27 May	Iberia
21 May - 28 May	Iberia	direct
07 May - 14 May	Iberia	direct
14 May - 21 May	Iberia	direct
06 May - 13 May	Iberia	direct
05 May - 12 May	Iberia
02 May - 09 May	TAP
08 May - 02 Jun	British Airways
11 May - 18 May	Iberia
05 May - 05 Jun	Scandinavian Airlines
31 May - 07 Jun	Lufthansa
27 May - 03 Jun	Iberia	direct
26 May - 02 Jun	Iberia
29 May - 01 Jun	Iberia	direct
28 May - 04 Jun	Iberia
30 May - 02 Jun	Iberia
29 May - 05 Jun	Iberia
30 May - 06 Jun	Iberia

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

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 May from 399€

Return flights