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

Return flights

05 Aug - 19 Aug	Iberia
23 Aug - 06 Sep	Air France	direct
13 Aug - 20 Aug	Iberia
05 Aug - 19 Aug	Iberia	direct
11 Aug - 23 Aug	Aer Lingus
21 Aug - 28 Aug	Air France	direct
11 Aug - 23 Aug	Air France	direct
16 Aug - 23 Aug	Air France	direct
14 Aug - 21 Aug	Air France	direct
13 Aug - 20 Aug	Air France	direct
05 Aug - 14 Aug	Aer Lingus
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 $379

Return flights