Are there nonstop flights from Washington (IAD) to Zakynthos (ZTH)?

No. The fastest connection is via Rome, about 10h 31m of total flying time.

What is the fastest connection from Washington (IAD) to Zakynthos (ZTH)?

via Rome ≈ 10h 31m, via Geneva ≈ 10h 32m, via Venice ≈ 10h 35m (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 Zakynthos International Airport "Dionysios Solomos" (ZTH)・8,096 km

No nonstop flights. The fastest connection is via Rome (FCO), about 10h 31m of flying time (layover not included).

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

None.

14 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.