Are there nonstop flights from Cancún (CUN) to Buenos Aires (EZE)?

Yes. Aerolíneas Argentinas fly this route. Flight time is about 8h 37m.

What is the fastest connection from Cancún (CUN) to Buenos Aires (EZE)?

via Panama City ≈ 9h 8m, via San José ≈ 9h 9m, via Medellín ≈ 9h 11m (estimated flying time, excluding layovers).

from 30,000 ANA miles, from 37,000 JAL miles (economy, one way, based on the published award charts).

Cancún International Airport (CUN) to Ezeiza International Airport - Ministro Pistarini (EZE)・6,895 km

Nonstop flights available (1 airline). Flight time about 8h 37m. Nonstop return flights also operate.

With milesANA 30,000 miles+ (via PTY)JAL 37,000 miles+ (via MIA)Economy, one way, estimate. Tap a connection for miles by cabin.

16 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.