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

Return flights

14 May - 18 May	Air Europa
04 May - 11 May	Iberia
05 May - 12 May	TAP
01 May - 10 May	TAP
03 May - 10 May	TAP
23 May - 30 May	KLM
14 May - 25 May	KLM
20 May - 05 Jun	KLM
29 May - 05 Jun	KLM
24 May - 30 May	KLM
13 May - 28 May	KLM
16 May - 23 May	Air France
28 May - 04 Jun	Iberia
27 May - 03 Jun	Iberia	direct
31 May - 07 Jun	Iberia	direct
29 May - 05 Jun	Finnair	direct
26 May - 02 Jun	Iberia
30 May - 02 Jun	Iberia
20 May - 05 Jun	Iberia	direct
31 May - 03 Jun	Iberia	direct

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.

Book a cheap hotel in Boston

Cheap car rent in Boston

Cheapest return flights from Madrid to Boston in May from 319€

Return flights