Private Transfer:
There are a number of companies that have private transfer service from EZE airport to the city center. This is one
Buenos Aires Ezeiza Airport Taxis and Transfers | Book Online (welcomepickups.com)
This one above was used by an ACBS staff member with great success. They were on time, met inside the terminal with name on a sign/tablet, communicated frequently via What's App. (Instructions about downloading their app and connecting via What's App, etc. were all well detailed in emails received prior to flying.)
Your driver may or may not only speak Spanish, but even if they don't speak your language, with a private transfer you are able to indicate your drop off destination online so little communication is needed.
40-60 minutes, depending on traffic.
This is another option suggested by locals:
https://taxisejecutivo.com.ar/
(Note, you may see a reference to a "Remis", which is a pre-paid, fixed rate taxi.
Taxis:
Taxis are available and plentiful and slightly less expensive than a private transfer, but please note that taxis only accept cash (pesos). We recommend that you DO NOT change dollars/reis/euros/pounds/etc. at the money changing booths in the airport. They give low rates of exchange AND charge an additional service fee. Instead, find an ATM (cajero) in the arrivals lobby of the airport (directly in front of the McDonald's near the shops) and extract what you need.
Taxi drivers have mixed reviews. Many have no problem with them, others report that drivers don't turn on the meter, etc.
40-60 minutes, depending on traffic.
Bus:
This option is the least expensive but will take you approximately 1.5-2 hours to arrive in the city center. You need to have a Sube card to ride. (You can purchase a Sube card at the ""open 25hs" drugstore in the public area of the arrival hall at EZE airport.)
Shared shuttle:
There are a few companies who offer an hourly shuttle service (double check that the times work for your flight, they may not operate 24 hours per day). This is usually 1/2 or less than half of the cost of a private car. They drop you to a center point in the city, so you may still need a taxi to reach your final destination.
The Ezeiza Airport ยป Madero Terminal route will get you the closest to the conference venue.
Other information:
EZE airport has free, accessible wifi so that you should be able to communicate as soon as you land.
Note, a 9:00am airplane touchdown, resulted in being out of the airport by 9:30am. It of course can't be guaranteed that it will always be that fast, but it could be. Also note, after immigration and luggage collection all luggage is scanned once more before exiting the airport. This final scan is actually a scan looking for excessive goods that may be sold or brought in to avoid tax. (A bag full of boxed, new shoes, 5 laptops, etc. is what they are looking for at that scan.)
A few sites with more details.
6 Buenos Aires Airport Transportation Options (EZE) - LandingPadBA
How getting from Ezeiza Buenos Aires airport to Buenos Aires (secretsofbuenosaires.com)