Are there nonstop flights from Washington (IAD) to Split (SPU)?

No. The fastest connection is via Newark, about 9h 43m of total flying time.

What is the fastest connection from Washington (IAD) to Split (SPU)?

via Newark ≈ 9h 43m, via Geneva ≈ 9h 43m, via Paris ≈ 9h 44m (estimated flying time, excluding layovers).

from 27,500 ANA miles, from 37,000 JAL miles (economy, one way, based on the published award charts).

Washington Dulles International Airport (IAD) to Split Saint Jerome Airport (SPU)・7,413 km

No nonstop flights. The fastest connection is via Newark (EWR), about 9h 43m of flying time (layover not included).

With milesANA 27,500 miles+ (via EWR)JAL 37,000 miles+ (via CDG)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

18 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.