Are there nonstop flights from Seattle (SEA) to Buenos Aires (EZE)?

No. The fastest connection is via Mexico City, about 14h 7m of total flying time.

What is the fastest connection from Seattle (SEA) to Buenos Aires (EZE)?

via Mexico City ≈ 14h 7m, via Houston ≈ 14h 10m, via Dallas-Fort Worth ≈ 14h 10m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 40,000 JAL miles (economy, one way, based on the published award charts).

Seattle–Tacoma International Airport (SEA) to Ezeiza International Airport - Ministro Pistarini (EZE)・11,130 km

No nonstop flights. The fastest connection is via Mexico City (MEX), about 14h 7m of flying time (layover not included).

With milesANA 30,000 miles+ (via IAH)JAL 40,000 miles+ (via DFW)Economy, one way, estimate. Tap a connection for miles by cabin.

None.

15 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.