Cheapest return flights from Washington to Madrid in September from $538

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

Return flights

07 Sep - 13 Sep TAP
22 Sep - 30 Sep Iberia direct
15 Sep - 22 Sep TAP
30 Sep - 05 Oct Royal Air Maroc
05 Sep - 12 Sep TAP
03 Sep - 13 Sep TAP
01 Sep - 08 Sep Finnair direct
21 Sep - 05 Oct Aer Lingus
01 Sep - 20 Sep TAP
30 Sep - 05 Oct Finnair direct
01 Sep - 20 Sep Finnair direct
12 Sep - 26 Sep Air Canada
17 Sep - 05 Oct Air Canada
07 Sep - 13 Sep Finnair direct

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

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