Cheapest return flights from Madrid to Washington in September from $497

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

Return flights

15 Sep - 21 Sep KLM
08 Sep - 14 Sep KLM
20 Sep - 30 Sep KLM
04 Sep - 11 Sep Delta
20 Sep - 28 Sep KLM
09 Sep - 17 Sep Delta
15 Sep - 28 Sep KLM
05 Sep - 15 Sep Delta
02 Sep - 11 Sep KLM
02 Sep - 14 Sep KLM
26 Sep - 03 Oct KLM
23 Sep - 07 Oct Delta
30 Sep - 22 Oct Delta
24 Sep - 08 Oct KLM
23 Sep - 14 Oct Delta
23 Sep - 14 Oct Finnair direct
28 Sep - 03 Oct Delta

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

Cheap car rent in Washington

Feel free to contact us with any feedback or request another flight research.