Are there nonstop flights from Washington (IAD) to Buenos Aires (EZE)?

No. The fastest connection is via Santa Cruz, about 10h 55m of total flying time.

What is the fastest connection from Washington (IAD) to Buenos Aires (EZE)?

via Santa Cruz ≈ 10h 55m, via Oranjestad ≈ 10h 55m, via Punta Cana ≈ 10h 57m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 45,000 JAL miles (economy, one way, based on the published award charts).

Washington Dulles International Airport (IAD) to Ezeiza International Airport - Ministro Pistarini (EZE)・8,430 km

No nonstop flights. The fastest connection is via Santa Cruz (VVI), about 10h 55m of flying time (layover not included).

With milesANA 30,000 miles+ (via BOG)JAL 45,000 miles+ (via DFW)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

19 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.