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

Return flights

04 Dec - 07 Dec	TAP
04 Dec - 08 Dec	TAP
05 Dec - 08 Dec	Delta
05 Dec - 09 Dec	KLM
22 Dec - 28 Dec	TAP
18 Dec - 28 Dec	TAP
21 Dec - 31 Dec	TAP
22 Dec - 01 Jan	TAP
21 Dec - 01 Jan	TAP
09 Dec - 14 Dec	British Airways
18 Dec - 28 Dec	Iberia	direct
25 Dec - 04 Jan	Iberia	direct
09 Dec - 14 Dec	Finnair	direct
21 Dec - 08 Jan	TAP
22 Dec - 02 Jan	TAP
20 Dec - 04 Jan	Aer Lingus
21 Dec - 01 Jan	Iberia	direct
21 Dec - 08 Jan	Iberia	direct
27 Dec - 04 Jan	Aer Lingus
22 Dec - 06 Jan	Delta

Also check the deals for one-way flights from Madrid to Washington 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 Madrid to Washington in December from $496

Return flights