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

No. The fastest connection is via Newark, about 19h 26m of total flying time.

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

via Newark ≈ 19h 26m, via New York ≈ 19h 27m, via Seattle ≈ 20h 40m (estimated flying time, excluding layovers).

from 40,000 ANA miles (economy, one way, based on the published award charts).

Ronald Reagan Washington National Airport (DCA) to Singapore Changi Airport (SIN)・15,544 km

No nonstop flights. The fastest connection is via Newark (EWR), about 19h 26m of flying time (layover not included).

With milesANA 40,000 miles+ (via SFO)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

5 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.