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

Return flights

05 May - 10 May	TAP
02 May - 09 May	TAP
06 May - 09 May	Iberia
08 May - 11 May	Iberia
22 May - 25 May	Iberia
19 May - 26 May	Iberia
12 May - 19 May	Iberia
13 May - 16 May	Iberia
05 May - 12 May	Iberia
15 May - 18 May	Iberia
29 May - 01 Jun	Iberia
28 May - 04 Jun	Iberia
27 May - 03 Jun	Iberia
25 May - 01 Jun	Iberia
25 May - 01 Jun	Finnair	direct
29 May - 05 Jun	Iberia
30 May - 02 Jun	Iberia
30 May - 06 Jun	Iberia
31 May - 07 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.

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Cheapest return flights from Madrid to Boston in May from 397€

Return flights