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

Return flights

29 Aug - 13 Sep	KLM
30 Aug - 13 Sep	KLM
26 Aug - 09 Sep	KLM
31 Aug - 08 Sep	KLM
29 Aug - 21 Sep	KLM
28 Aug - 23 Sep	KLM
29 Aug - 08 Sep	KLM
29 Aug - 25 Sep	KLM
31 Aug - 07 Sep	KLM
29 Aug - 06 Sep	Delta
21 Aug - 31 Aug	Iberia
26 Aug - 31 Aug	TAP
25 Aug - 30 Aug	Air Europa
23 Aug - 30 Aug	TAP
23 Aug - 31 Aug	TAP
25 Aug - 31 Aug	TAP
24 Aug - 31 Aug	TAP
22 Aug - 30 Aug	TAP
20 Aug - 30 Aug	Air Europa
20 Aug - 27 Aug	Air Europa

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 436€

Return flights