Cheapest return flights from Boston to Madrid in September from $449

Best time to book flights for Boston (BOS) to Madrid (MAD) flights at AirHint

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

Return flights

09 Sep - 14 Sep Fly Play
28 Sep - 05 Oct TAP
23 Sep - 26 Sep Iberia
17 Sep - 24 Sep Iberia direct
23 Sep - 30 Sep Iberia direct
24 Sep - 01 Oct Iberia direct
30 Sep - 07 Oct Iberia direct
21 Sep - 24 Sep Iberia
18 Sep - 29 Sep Scandinavian Airlines
18 Sep - 22 Sep Scandinavian Airlines
02 Sep - 09 Sep Iberia direct
03 Sep - 10 Sep Iberia direct
09 Sep - 16 Sep Iberia direct
28 Sep - 05 Oct Finnair direct
25 Sep - 02 Oct Iberia direct
26 Sep - 03 Oct Iberia direct
29 Sep - 06 Oct Iberia direct
28 Sep - 01 Oct Iberia
29 Sep - 02 Oct Iberia
30 Sep - 03 Oct 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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