Are there nonstop flights from Washington (IAD) to Riyadh (RUH)?

Yes. Saudia fly this route. Flight time is about 13h 15m.

What is the fastest connection from Washington (IAD) to Riyadh (RUH)?

via Munich ≈ 13h 45m, via Frankfurt am Main ≈ 13h 45m, via London ≈ 13h 46m (estimated flying time, excluding layovers).

from 35,000 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

Washington Dulles International Airport (IAD) to King Khalid International Airport (RUH)・10,842 km

Nonstop flights available (1 airline). Flight time about 13h 15m. Nonstop return flights also operate.

With milesANA 35,000 miles+ (via MUC)JAL 45,000 miles+ (via LHR)Economy, one way, estimate. Tap a connection for miles by cabin.

25 one-stop options, sorted by estimated flying time. Tap one to see the airlines on each leg and booking links.

Times are estimated from distance. Check schedules, frequency and availability with the airline or a booking site.