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

Return flights

02 Dec - 09 Dec	KLM
09 Dec - 16 Dec	United
09 Dec - 08 Jan	British Airways
11 Dec - 10 Jan	United
11 Dec - 09 Jan	Iberia
11 Dec - 28 Dec	United
12 Dec - 28 Dec	United
13 Dec - 11 Jan	Iberia
23 Dec - 31 Dec	Air Canada
14 Dec - 30 Dec	Delta
14 Dec - 21 Dec	Delta
30 Dec - 10 Jan	British Airways
29 Dec - 05 Jan	United
21 Dec - 13 Jan	Air Canada
13 Dec - 20 Dec	United
23 Dec - 08 Jan	Air Canada
21 Dec - 28 Dec	British Airways
18 Dec - 01 Jan	Air Canada
21 Dec - 01 Jan	Air Canada
19 Dec - 26 Dec	United

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 312€

Return flights