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

Return flights

06 May - 10 May	TAP
12 May - 19 May	Iberia
22 May - 25 May	Iberia
15 May - 18 May	Iberia
20 May - 23 May	Iberia
27 May - 30 May	Iberia
08 May - 11 May	Iberia
19 May - 26 May	Iberia
15 May - 19 May	Iberia
06 May - 09 May	Iberia
28 May - 04 Jun	Iberia
29 May - 01 Jun	Iberia
27 May - 03 Jun	Iberia
25 May - 01 Jun	Iberia	direct
29 May - 05 Jun	Iberia
26 May - 02 Jun	Iberia
29 May - 02 Jun	Iberia
30 May - 06 Jun	Iberia
31 May - 07 Jun	Iberia	direct
30 May - 02 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 $462

Return flights