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

Return flights

30 Sep - 30 Oct	TAP
10 Sep - 17 Sep	TAP
30 Sep - 07 Oct	Air Canada
24 Sep - 15 Oct	TAP
09 Sep - 16 Sep	TAP
23 Sep - 30 Sep	Turkish Airlines
15 Sep - 30 Sep	Turkish Airlines
30 Sep - 10 Oct	Turkish Airlines
30 Sep - 14 Oct	Turkish Airlines
04 Sep - 16 Oct	Turkish Airlines
22 Sep - 30 Sep	Turkish Airlines
02 Sep - 29 Oct	Turkish Airlines
01 Sep - 24 Oct	Turkish Airlines
16 Sep - 16 Oct	Turkish Airlines
05 Sep - 16 Sep	Brussels Airlines
18 Sep - 25 Sep	Turkish Airlines
01 Sep - 15 Oct	Turkish Airlines
14 Sep - 29 Sep	TAP
01 Sep - 14 Sep	TAP
15 Sep - 29 Sep	Turkish Airlines

Also check the deals for one-way flights from Washington to Casablanca in September.

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 Casablanca in September from $473

Return flights