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

Return flights

03 Dec - 10 Dec	Air Canada
02 Dec - 10 Dec	Air Canada
02 Dec - 16 Dec	KLM
08 Dec - 16 Dec	British Airways
04 Dec - 11 Dec	Air Canada
01 Dec - 09 Dec	British Airways
05 Dec - 09 Dec	British Airways
02 Dec - 07 Dec	KLM
04 Dec - 13 Dec	Air Canada
06 Dec - 13 Dec	Iberia
28 Dec - 13 Jan	British Airways
25 Dec - 09 Jan	Iberia
14 Dec - 08 Jan	Delta
25 Dec - 08 Jan	Iberia
25 Dec - 07 Jan	Iberia
22 Dec - 11 Jan	British Airways
31 Dec - 05 Jan	Delta
18 Dec - 18 Jan	jetBlue
23 Dec - 07 Jan	Iberia
31 Dec - 07 Jan	Iberia

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 $423

Return flights