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 France
02 Dec - 09 Dec	Iberia
02 Dec - 16 Dec	KLM
05 Dec - 12 Dec	Iberia
08 Dec - 15 Dec	Iberia
04 Dec - 14 Dec	KLM
11 Dec - 14 Jan	United
05 Dec - 07 Dec	Delta
15 Dec - 17 Jan	British Airways
16 Dec - 18 Jan	British Airways
31 Dec - 11 Jan	Air France
30 Dec - 11 Jan	Delta
14 Dec - 08 Jan	British Airways
31 Dec - 05 Jan	Delta
12 Dec - 21 Dec	Delta
14 Dec - 30 Dec	British Airways
17 Dec - 07 Jan	Delta
22 Dec - 29 Dec	Delta
08 Dec - 11 Jan	KLM
22 Dec - 06 Jan	Delta

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 365€

Return flights