Are there nonstop flights from Washington (IAD) to Singapore (SIN)?

No. The fastest connection is via Beijing, about 19h 21m of total flying time.

What is the fastest connection from Washington (IAD) to Singapore (SIN)?

via Beijing ≈ 19h 21m, via Newark ≈ 19h 27m, via New York ≈ 19h 29m (estimated flying time, excluding layovers).

from 27,500 ANA miles, from 47,000 JAL miles (economy, one way, based on the published award charts).

Washington Dulles International Airport (IAD) to Singapore Changi Airport (SIN)・15,532 km

No nonstop flights. The fastest connection is via Beijing (PEK), about 19h 21m of flying time (layover not included).

With milesANA 27,500 miles+ (via HND)JAL 47,000 miles+ (via ICN)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

30 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.