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

Return flights

23 Oct - 12 Nov	TAP
06 Oct - 22 Oct	British Airways	direct
15 Oct - 22 Oct	British Airways	direct
26 Oct - 11 Nov	British Airways	direct
15 Oct - 21 Oct	Lufthansa
07 Oct - 31 Oct	Lufthansa
12 Oct - 23 Oct	Virgin Atlantic
05 Oct - 15 Oct	Air France
07 Oct - 14 Oct	Lufthansa
22 Oct - 29 Oct	SWISS
14 Oct - 30 Oct	Lufthansa
07 Oct - 24 Oct	SWISS
29 Oct - 05 Nov	TAP
13 Oct - 08 Nov	Lufthansa
15 Oct - 08 Nov	Lufthansa
30 Oct - 06 Nov	Delta
24 Oct - 02 Nov	TAP
20 Oct - 15 Nov	Lufthansa
23 Oct - 04 Nov	Air Canada
21 Oct - 15 Nov	Air Canada

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 339€

Return flights