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

Return flights

03 Dec - 10 Dec	TAP
13 Dec - 28 Dec	Scandinavian Airlines
03 Dec - 13 Dec	TAP
04 Dec - 14 Dec	TAP
02 Dec - 09 Dec	Finnair	direct
28 Dec - 06 Jan	Lufthansa
12 Dec - 22 Dec	TAP
04 Dec - 14 Dec	Finnair	direct
15 Dec - 10 Jan	TAP
25 Dec - 29 Dec	Lufthansa
23 Dec - 27 Dec	TAP
16 Dec - 08 Jan	Virgin Atlantic
23 Dec - 01 Jan	Air Canada
28 Dec - 04 Jan	TAP
16 Dec - 09 Jan	Virgin Atlantic
26 Dec - 29 Dec	Aer Lingus
22 Dec - 09 Jan	KLM
22 Dec - 01 Jan	KLM
18 Dec - 09 Jan	Delta
17 Dec - 10 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 388€

Return flights