Austin (AUS) to Buenos Aires (BUE): 5,164 miles (8,311 km) great-circle, about 10h 50m nonstop by our estimate. Cheapest fare observed: $838 round-trip on LATAM, with 2 stops, departing July 23, 2026.
$838 round-trip, LATAM LA6624, departing 2026-07-23 at 10:35, returning 2026-08-06. The recorded itinerary left on a Thursday, returning on a Thursday 14 nights later; the fare was observed 89 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $838, it ranked 26th of the 30 round-trip fares we recorded from AUS (median $292). That is 16.2 cents per great-circle mile (round-trip price over one-way distance), below the AUS median of 22.5 cents across 30 round-trip routes.
Routes from AUS of similar length: Lisbon (4,877 mi) at $1327 and Dubrovnik (5,973 mi) at $1141.
AUS to BUE is the only one of 30 AUS routes where LATAM priced cheapest. It is the 4th longest of the 30 routes we track from AUS.
Of 14 departure airports with a fare to Buenos Aires, Austin (AUS) ranked 10th at $838. Lowest: $251 from Rio de Janeiro (GIG); highest: $2255 from Addis Ababa (ADD); 5 nonstop. Cheapest-fare airlines (routes): Arajet (3), LATAM (2), Aeromexico (1), Air Canada (1), Avianca (1) and Cathay Pacific (1), plus 5 more.
Travelpayouts fares (cheapest per route, observed April 25, 2026); OurAirports coordinates and elevations; IANA zones America/Chicago, America/Argentina/Buenos_Aires; flight time is our estimate.