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

Return flights

09 Sep - 16 Sep	Royal Jordanian
12 Sep - 15 Sep	Etihad Airways
10 Sep - 17 Sep	Etihad Airways
30 Sep - 07 Oct	Etihad Airways
12 Sep - 26 Sep	Etihad Airways
05 Sep - 08 Sep	Etihad Airways
17 Sep - 24 Sep	Etihad Airways
10 Sep - 20 Sep	Etihad Airways
04 Sep - 11 Sep	Etihad Airways
29 Sep - 13 Oct	Etihad Airways
03 Sep - 06 Sep	Etihad Airways
12 Sep - 10 Oct	Turkish Airlines
03 Sep - 15 Sep	KLM
29 Sep - 13 Oct	Saudia	direct
12 Sep - 10 Oct	Saudia	direct

Also check the deals for one-way flights from Riyadh to Washington 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 Riyadh to Washington in September from 575€

Return flights