Are there nonstop flights from Washington (IAD) to Guam (GUM)?

No. The fastest connection is via Tokyo, about 16h 46m of total flying time.

What is the fastest connection from Washington (IAD) to Guam (GUM)?

via Tokyo ≈ 16h 46m, via Honolulu ≈ 17h 17m, via Seoul ≈ 17h 57m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 47,000 JAL miles (economy, one way, based on the published award charts).

Washington Dulles International Airport (IAD) to Antonio B. Won Pat International Airport (GUM)・12,722 km

No nonstop flights. The fastest connection is via Tokyo (HND), about 16h 46m of flying time (layover not included).

With milesANA 30,000 miles+ (via HND)JAL 47,000 miles+ (via ICN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

4 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.