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

Return flights

30 Aug - 13 Sep	KLM
30 Aug - 07 Sep	KLM
28 Aug - 15 Sep	KLM
27 Aug - 02 Sep	KLM
29 Aug - 08 Sep	KLM
29 Aug - 13 Sep	KLM
28 Aug - 07 Sep	KLM
29 Aug - 06 Sep	KLM
29 Aug - 05 Sep	KLM
27 Aug - 31 Aug	KLM
26 Aug - 31 Aug	KLM
24 Aug - 02 Sep	Vueling Airlines
24 Aug - 31 Aug	Vueling Airlines
14 Aug - 18 Aug	Condor
14 Aug - 19 Aug	Condor
28 Aug - 31 Aug	Iberia
14 Aug - 17 Aug	Condor
20 Aug - 27 Aug	Ryanair
14 Aug - 26 Aug	Condor
26 Aug - 29 Aug	Wizz Air Malta

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

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 August from 464€

Return flights