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

Return flights

09 Dec - 16 Dec	Lufthansa
09 Dec - 23 Dec	Lufthansa
30 Dec - 15 Jan	SWISS
30 Dec - 13 Jan	SWISS
09 Dec - 17 Dec	Lufthansa	direct
11 Dec - 15 Dec	Lufthansa
28 Dec - 16 Jan	Lufthansa
11 Dec - 15 Dec	Lufthansa	direct
31 Dec - 11 Jan	TAP
29 Dec - 16 Jan	Lufthansa
13 Dec - 16 Dec	Aer Lingus
14 Dec - 13 Jan	Lufthansa
13 Dec - 15 Dec	Aer Lingus
16 Dec - 25 Dec	United
30 Dec - 13 Jan	British Airways	direct
28 Dec - 17 Jan	Lufthansa
14 Dec - 21 Dec	Lufthansa
12 Dec - 15 Dec	Aer Lingus
30 Dec - 11 Jan	TAP
27 Dec - 16 Jan	Aer Lingus

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 381€

Return flights