Are there nonstop flights from Bangkok (BKK) to Washington (IAD)?

No. The fastest connection is via Beijing, about 17h 58m of total flying time.

What is the fastest connection from Bangkok (BKK) to Washington (IAD)?

via Beijing ≈ 17h 58m, via Seoul ≈ 18h 28m, via Taipei ≈ 18h 48m (estimated flying time, excluding layovers).

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

Suvarnabhumi Airport (BKK) to Washington Dulles International Airport (IAD)・14,160 km

No nonstop flights. The fastest connection is via Beijing (PEK), about 17h 58m 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.

26 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.