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

Return flights

01 Dec - 08 Dec	TAP
02 Dec - 09 Dec	TAP
04 Dec - 11 Dec	TAP
02 Dec - 09 Dec	Finnair	direct
08 Dec - 15 Dec	TAP
10 Dec - 17 Dec	TAP
04 Dec - 11 Dec	Finnair	direct
11 Dec - 18 Dec	TAP
31 Dec - 09 Jan	TAP
06 Dec - 13 Dec	TAP
31 Dec - 07 Jan	TAP
12 Dec - 19 Dec	Air Canada
25 Dec - 11 Jan	TAP
30 Dec - 06 Jan	Air Canada
12 Dec - 10 Jan	TAP
28 Dec - 04 Jan	TAP
23 Dec - 09 Jan	Air Canada
26 Dec - 02 Jan	Aer Lingus
22 Dec - 04 Jan	Scandinavian Airlines
30 Dec - 06 Jan	Finnair	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 273€

Return flights