Cheapest return flights from Boston to Madrid in September from $351

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

Return flights

09 Sep - 22 Sep Finnair direct
08 Sep - 22 Sep Finnair direct
09 Sep - 23 Sep Finnair direct
05 Sep - 15 Sep Air Canada
16 Sep - 01 Oct Aer Lingus direct
09 Sep - 21 Sep Air Canada
09 Sep - 21 Sep Finnair direct
05 Sep - 15 Sep Finnair direct
10 Sep - 22 Sep Finnair direct
03 Sep - 08 Sep Finnair direct
04 Sep - 11 Sep Finnair direct
29 Sep - 02 Oct Iberia direct
28 Sep - 01 Oct Iberia direct
30 Sep - 03 Oct Iberia direct

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

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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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