ARS 240 gets you from Retiro to Aeroparque on Colectivo 37
Colectivo 37 is a regular city bus that runs between Retiro/Once areas and Aeroparque Jorge Newbery (AEP), and you pay with a SUBE card only. The stop for the airport sits on Avenida Costanera Rafael Obligado, a few minutes’ walk from the terminal doors, so this is not a door-to-door option but it lands you close for a fraction of a taxi fare. Expect the ride from central Buenos Aires to take 25–45 minutes depending on traffic along Costanera and Libertador.
Fares on Colectivo 37 usually fall in the ARS 200–300 range for the segments that cover Aeroparque, significantly cheaper than the ARS 6,000–10,000 you’ll see on taxis or app cars from downtown. You need a loaded SUBE card before boarding; drivers do not take cash or cards. SUBE recharge spots are easy to find at Retiro station, several Subte (metro) stations, and many kioscos in Microcentro, often posted with a blue SUBE sign.
The bus runs 24 hours with higher frequency in daytime, often every 10–15 minutes in rush hours and stretching to around 20–30 minutes late at night. There are different branches of line 37, and only some go by Aeroparque along Costanera Rafael Obligado, so check the bus front sign for “Aeroparque” or “Costanera” before you tap in. Plan on extra time in the afternoon between 17:00 and 20:00 when Avenida del Libertador and Costanera usually clog up.
From Aeroparque into the city, you walk out toward Avenida Costanera Rafael Obligado and look for the parada (stop) marked for line 37 heading toward Retiro or Once. The walk from arrivals to the stop can take 5–8 minutes depending on which exit you use. With luggage, a small carry-on or backpack works best; the bus is used by locals and can get crowded, especially around 08:00–09:30 and 18:00–19:30.
Step-by-step: Using Colectivo 37 to or from Aeroparque
- 1. Buy and load a SUBE card in town (for example at Retiro station or a kiosco near Florida Street) with at least ARS 500.
- 2. Check a live map app for “Línea 37 Aeroparque/Costanera” and confirm the branch that lists Aeroparque or Costanera Rafael Obligado in the route.
- 3. In the city, wait at a marked 37 stop along Avenida del Libertador, Paseo Colón, or near Retiro; confirm with the driver that the bus passes Aeroparque before tapping your SUBE.
- 4. Tap your SUBE on the reader when boarding; the driver sets the fare, which should show around ARS 200–300 for the airport stretch.
- 5. Watch for the Aeroparque stop along Avenida Costanera Rafael Obligado and get off when you see the terminal buildings ahead, then walk 5–8 minutes to departures.
- 6. Leaving the airport, walk out to Costanera Rafael Obligado, stand at the marked 37 stop toward Retiro/Once, and repeat the same tap-on routine with your SUBE.
One practical tip: if your arrival time is after 22:00, check the next-bus wait in a maps app; if it shows more than 25 minutes, a taxi from the terminal rank may be worth the extra pesos.