AirHint found the following cheapest return flights from Madrid (MAD) to Boston (BOS) in September 2025 (see full year).

Return flights

30 Sep - 14 Oct	Iberia Express
16 Sep - 30 Sep	Vueling Airlines
18 Sep - 29 Sep	Vueling Airlines
17 Sep - 29 Sep	Air Europa
18 Sep - 21 Sep	Vueling Airlines
15 Sep - 30 Sep	Wizz Air Malta
15 Sep - 23 Sep	Wizz Air Malta
16 Sep - 23 Sep	Iberia	direct
16 Sep - 24 Sep	Iberia	direct
16 Sep - 25 Sep	Iberia	direct
10 Sep - 15 Sep	KLM
26 Sep - 04 Oct	KLM
26 Sep - 05 Oct	KLM
29 Sep - 08 Oct	KLM
30 Sep - 14 Oct	Finnair	direct
29 Sep - 06 Oct	Iberia	direct
24 Sep - 01 Oct	Iberia
30 Sep - 07 Oct	Iberia
25 Sep - 02 Oct	Iberia	direct
26 Sep - 03 Oct	Iberia

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

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 September from 392€

Return flights