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	Finnair
09 Dec - 16 Dec	British Airways
02 Dec - 16 Dec	Air France
10 Dec - 17 Dec	Air Canada
08 Dec - 15 Dec	Air Canada
02 Dec - 25 Dec	Air Canada
09 Dec - 25 Dec	Air Canada
04 Dec - 16 Dec	British Airways
03 Dec - 13 Dec	Delta
02 Dec - 23 Dec	Air Canada
31 Dec - 15 Jan	Air Canada
30 Dec - 21 Jan	Air Canada
30 Dec - 20 Jan	Air Canada
24 Dec - 14 Jan	KLM
09 Dec - 01 Jan	Air Canada
31 Dec - 07 Jan	Iberia
24 Dec - 19 Jan	KLM
23 Dec - 13 Jan	British Airways
23 Dec - 06 Jan	Air Canada
25 Dec - 19 Jan	British Airways

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 $356

Return flights