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

Return flights

05 Aug - 14 Aug	British Airways	direct
05 Aug - 12 Aug	British Airways	direct
06 Aug - 13 Aug	Air Canada
06 Aug - 14 Aug	Air Canada
06 Aug - 14 Aug	Finnair	direct
06 Aug - 13 Aug	Finnair	direct
06 Aug - 15 Aug	Iberia
06 Aug - 15 Aug	Finnair	direct

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 $579

Return flights