Are there nonstop flights from Singapore (SIN) to Denver (DEN)?

No. The fastest connection is via Vancouver, about 18h 10m of total flying time.

What is the fastest connection from Singapore (SIN) to Denver (DEN)?

via Vancouver ≈ 18h 10m, via Seattle ≈ 18h 12m, via Tokyo ≈ 18h 14m (estimated flying time, excluding layovers).

from 40,000 ANA miles, from 50,000 JAL miles (economy, one way, based on the published award charts).

Singapore Changi Airport (SIN) to Denver International Airport (DEN)・14,585 km

No nonstop flights. The fastest connection is via Vancouver (YVR), about 18h 10m of flying time (layover not included).

With milesANA 40,000 miles+ (via YVR)JAL 50,000 miles+ (via LHR)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

12 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.