Cheapest return flights from Washington to Madrid in September from $424

Best time to book flights for Washington (IAD) to Madrid (MAD) flights at AirHint

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

Return flights

07 Sep - 24 Sep Scandinavian Airlines
10 Sep - 17 Sep Scandinavian Airlines
14 Sep - 25 Sep Scandinavian Airlines
28 Sep - 06 Oct TAP
24 Sep - 30 Sep TAP
29 Sep - 06 Oct TAP
28 Sep - 05 Oct TAP
19 Sep - 28 Sep TAP
25 Sep - 05 Oct TAP
16 Sep - 21 Sep TAP
24 Sep - 30 Sep Finnair direct
17 Sep - 21 Sep TAP
02 Sep - 18 Sep Finnair direct
18 Sep - 25 Sep Iberia direct
28 Sep - 05 Oct Iberia direct
25 Sep - 04 Oct TAP
28 Sep - 06 Oct United direct
29 Sep - 06 Oct United direct
25 Sep - 05 Oct Finnair direct
25 Sep - 04 Oct American Airlines direct

Also check the deals for one-way flights from Washington 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.

Book a cheap hotel in Madrid

Cheap car rent in Madrid