Cheapest return flights from Boston to Madrid in September from $328

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

Return flights

22 Sep - 02 Oct American Airlines
23 Sep - 30 Sep British Airways
26 Sep - 03 Oct British Airways
25 Sep - 02 Oct British Airways
29 Sep - 06 Oct British Airways
30 Sep - 06 Oct British Airways
21 Sep - 30 Sep Air France
24 Sep - 30 Sep Delta
30 Sep - 26 Oct Aer Lingus
29 Sep - 06 Oct American Airlines direct
21 Sep - 11 Oct British Airways
30 Sep - 07 Oct Iberia
25 Sep - 02 Oct Finnair direct
25 Sep - 30 Sep British Airways
17 Sep - 24 Sep Air France
28 Sep - 30 Sep jetBlue direct
21 Sep - 28 Sep SWISS
21 Sep - 28 Sep jetBlue direct
23 Sep - 30 Sep jetBlue direct
19 Sep - 26 Sep Iberia

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

Skyscanner

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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