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

Return flights

07 Dec - 16 Dec	British Airways
02 Dec - 16 Dec	United
08 Dec - 15 Dec	British Airways
28 Dec - 13 Jan	Iberia
04 Dec - 11 Dec	Air Canada
05 Dec - 12 Dec	Air Canada
05 Dec - 09 Dec	Air Canada
04 Dec - 09 Dec	British Airways
11 Dec - 11 Jan	Iberia
05 Dec - 08 Dec	Iberia
28 Dec - 11 Jan	Iberia
11 Dec - 17 Dec	Iberia
04 Dec - 14 Dec	American Airlines
30 Dec - 09 Jan	British Airways
28 Dec - 08 Jan	Iberia
09 Dec - 10 Jan	British Airways
07 Dec - 08 Jan	British Airways
23 Dec - 08 Jan	Iberia
24 Dec - 09 Jan	British Airways
25 Dec - 08 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 $437

Return flights