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

Return flights

16 Oct - 21 Oct	TAP
12 Oct - 20 Oct	TAP
16 Oct - 20 Oct	TAP
15 Oct - 22 Oct	TAP
29 Oct - 12 Nov	TAP
18 Oct - 29 Oct	TAP
29 Oct - 05 Nov	TAP
02 Oct - 07 Oct	TAP
28 Oct - 27 Nov	TAP
01 Oct - 29 Oct	TAP
30 Oct - 06 Nov	TAP
14 Oct - 30 Oct	Finnair	direct
14 Oct - 28 Oct	Finnair	direct
08 Oct - 15 Oct	Iberia	direct
28 Oct - 27 Nov	American Airlines	direct
27 Oct - 04 Nov	Iberia
21 Oct - 03 Nov	Air Canada
26 Oct - 03 Nov	Air Canada
26 Oct - 15 Nov	Air Canada
06 Oct - 01 Nov	TAP

Also check the deals for one-way flights from Washington to Madrid 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 Washington to Madrid in October from $325

Return flights