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

Return flights

04 Dec - 11 Dec	TAP
04 Dec - 11 Dec	Iberia	direct
30 Dec - 13 Jan	Air Canada
30 Dec - 13 Jan	Finnair	direct
12 Dec - 28 Dec	Air Canada
27 Dec - 15 Jan	Delta
24 Dec - 31 Dec	Lufthansa
14 Dec - 21 Dec	United
14 Dec - 21 Dec	Iberia	direct
25 Dec - 01 Jan	Lufthansa
25 Dec - 04 Jan	TAP
22 Dec - 02 Jan	Lufthansa
23 Dec - 19 Jan	Delta
23 Dec - 04 Jan	TAP
21 Dec - 28 Dec	Lufthansa
18 Dec - 07 Jan	TAP
23 Dec - 07 Jan	TAP
20 Dec - 27 Dec	Lufthansa
21 Dec - 28 Dec	Iberia	direct

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 321€

Return flights