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

Return flights

02 Dec - 16 Dec	Delta
03 Dec - 09 Dec	Delta
03 Dec - 10 Dec	Iberia
06 Dec - 15 Dec	Air Canada
28 Dec - 08 Jan	SWISS
12 Dec - 12 Jan	SWISS
09 Dec - 16 Dec	Iberia	direct
12 Dec - 13 Jan	British Airways
06 Dec - 12 Dec	Aer Lingus
12 Dec - 19 Dec	SWISS
07 Dec - 27 Dec	Air Canada
28 Dec - 17 Jan	SWISS
30 Dec - 07 Jan	Air Canada
02 Dec - 16 Dec	Iberia	direct
14 Dec - 13 Jan	British Airways	direct
23 Dec - 15 Jan	Air Canada
06 Dec - 15 Dec	United	direct
13 Dec - 13 Jan	Icelandair
26 Dec - 17 Jan	Lufthansa
24 Dec - 17 Jan	KLM

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

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 December from 372€

Return flights