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

Return flights

19 Aug - 26 Aug	Brussels Airlines
12 Aug - 26 Aug	Brussels Airlines
19 Aug - 26 Aug	Air France	direct
16 Aug - 23 Aug	Iberia
16 Aug - 23 Aug	Air France	direct
05 Aug - 14 Aug	Aer Lingus
02 Aug - 11 Aug	SWISS
03 Aug - 12 Aug	Lufthansa
12 Aug - 26 Aug	Aer Lingus	direct
29 Aug - 16 Sep	Aer Lingus
07 Aug - 23 Aug	Aer Lingus
29 Aug - 16 Sep	Finnair	direct
29 Aug - 01 Sep	Iberia
31 Aug - 03 Sep	Iberia
30 Aug - 02 Sep	Iberia

Also check the deals for one-way flights from Boston to Madrid 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 Boston to Madrid in August from $364

Return flights