São Paulo (GRU) to Buenos Aires (BUE): 1,070 miles (1,723 km) great-circle, about 2h 40m nonstop by our estimate. Cheapest fare observed: $292 round-trip on Air Canada, nonstop, departing May 9, 2026.
$292 round-trip, Air Canada AC90, departing 2026-05-09 at 11:35, returning 2026-05-11. The recorded itinerary left on a Saturday, returning on a Monday 2 nights later; the fare was observed 14 days before departure. "Book this flight" opens Kiwi.com with the same airline and dates.
At $292, it ranked 7th of the 30 round-trip fares we recorded from GRU (median $520). That is 27.3 cents per great-circle mile (round-trip price over one-way distance), above the GRU median of 21.3 cents across 30 round-trip routes.
Routes from GRU of similar length: Montevideo (975 mi) at $434 and Salvador (902 mi) at $188.
GRU to BUE is the only one of 30 GRU routes where Air Canada priced cheapest. It is the 23rd longest of the 30 routes we track from GRU.
Of 14 departure airports with a fare to Buenos Aires, São Paulo (GRU) ranked 2nd at $292. 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/Sao_Paulo, America/Argentina/Buenos_Aires; flight time is our estimate.