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

Return flights

07 Oct - 14 Oct	KLM
03 Oct - 13 Oct	Delta
13 Oct - 25 Oct	KLM
05 Oct - 16 Oct	KLM
13 Oct - 23 Oct	KLM
13 Oct - 26 Oct	KLM
14 Oct - 23 Oct	KLM
02 Oct - 12 Oct	KLM
08 Oct - 12 Oct	KLM
03 Oct - 12 Oct	KLM
24 Oct - 02 Nov	Aer Lingus

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

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

Return flights