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

Return flights

15 Dec - 01 Jan	TAP
14 Dec - 31 Dec	TAP
24 Dec - 31 Dec	United
13 Dec - 02 Jan	TAP
18 Dec - 31 Dec	Air Canada
26 Dec - 31 Dec	Air France
20 Dec - 01 Jan	KLM
19 Dec - 28 Dec	Saudia
07 Dec - 13 Dec	TAP
20 Dec - 02 Jan	Air Canada
24 Dec - 04 Jan	TAP
19 Dec - 04 Jan	Royal Air Maroc	direct
21 Dec - 04 Jan	Royal Air Maroc	direct
20 Dec - 02 Jan	Royal Air Maroc	direct
13 Dec - 02 Jan	Royal Air Maroc	direct
20 Dec - 03 Jan	United
24 Dec - 31 Dec	Royal Air Maroc	direct
14 Dec - 31 Dec	Royal Air Maroc	direct
19 Dec - 28 Dec	Royal Air Maroc	direct
19 Dec - 26 Dec	TAP

Also check the deals for one-way flights from Casablanca 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 Casablanca to Washington in December from $580

Return flights