Are there nonstop flights from Washington (IAD) to Boise (BOI)?

No. The fastest connection is via Chicago, about 4h 50m of total flying time.

What is the fastest connection from Washington (IAD) to Boise (BOI)?

via Chicago ≈ 4h 50m, via Minneapolis ≈ 4h 52m, via Bozeman ≈ 4h 54m (estimated flying time, excluding layovers).

from 15,000 ANA miles, from 23,000 JAL miles (economy, one way, based on the published award charts).

Washington Dulles International Airport (IAD) to Boise Air Terminal/Gowen Field (BOI)・3,251 km

No nonstop flights. The fastest connection is via Chicago (ORD), about 4h 50m of flying time (layover not included).

With milesANA 15,000 miles+ (via ORD)JAL 23,000 miles+ (via DFW)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

17 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.