Are there nonstop flights from Washington (IAD) to Riga (RIX)?

No. The fastest connection is via Reykjavík, about 9h 21m of total flying time.

What is the fastest connection from Washington (IAD) to Riga (RIX)?

via Reykjavík ≈ 9h 21m, via Copenhagen ≈ 9h 32m, via Edinburgh ≈ 9h 32m (estimated flying time, excluding layovers).

from 27,500 ANA miles (economy, one way, based on the published award charts).

Washington Dulles International Airport (IAD) to Riga International Airport (RIX)・7,087 km

No nonstop flights. The fastest connection is via Reykjavík (KEF), about 9h 21m of flying time (layover not included).

With milesANA 27,500 miles+ (via FRA)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

21 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.