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

Return flights

09 Dec - 13 Dec	TAP
16 Dec - 20 Jan	Air Canada
24 Dec - 31 Dec	United
11 Dec - 19 Dec	TAP
21 Dec - 06 Jan	Air Canada
16 Dec - 20 Jan	American Airlines	direct
18 Dec - 07 Jan	Air Canada
18 Dec - 05 Jan	Air Canada
18 Dec - 06 Jan	Air Canada
18 Dec - 01 Jan	Air Canada
19 Dec - 10 Jan	TAP
21 Dec - 04 Jan	TAP
19 Dec - 01 Jan	Air Canada

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 $493

Return flights