To get to Mar del Plata from abroad you will arrive in Buenos Aires, then you have different ways to get to Mar del Plata: by train, bus, taxi, car, or plane.

Boat & Equipment Transportation
Nearest port for the shipment of boats – The port of Buenos Aires is 3 miles from the Yacht Club Argentino. This is Argentina’s major port and receives containerized shipments from around the globe.

Travelling from Buenos Aires to Mar del Plata

Travelling by PLANE
Two airports serve the city:
Ezeiza International Airport (EZE)
To fly to Mar del Plata you need to change to Jorge Newbery Airport (AEP).
Visitors from the rest of the world are welcomed at this airport located 15 minutes away from downtown through a highway.

Jorge Newbery Airport (AEP).
Flights to Mar del Plata – 1hr flight
Tourists coming from the interior of the country or from bordering countries arrive at this airport located by the riverside, five minutes away from downtown. Both offer taxi, remise, transfer, and bus services 24 hours a day.

Please visit  https://turismo.buenosaires.gob.ar/en/article/accommodation  you will be able to download the full list of accredited accommodation in the city – from high-end to hostels

Travelliing By DIRECT BUS transfer from Buenos Aires airports to Mar del Plata:
You can go straight from the airport Ezeiza (EZE) or Jorge Newbery (AEP)
http://www.tiendaleonmdq.com/
whapp +54 9 223 5815819

EZE airport       AEP airportMDQ (Mar del Plata)
02:10 HS03:00 HS08:10 HS
10:00 HS10:50 HS16:00 HS
15:00 HS15:50 HS21:00 HS
21:30 HS22:20 HS04:00 HS

Or you can visit first Buenos Aires and then travel to Mar del Plata:

By Bus from the Buenos Aires city center:
From Retiro bus station: Hourly. Travel time 5:30 hrs.

By train:
From Constitution Station in city: Travel time 5:50 hrs.
Four times a week service:
https://www.rome2rio.com/map/Buenos-Aires/Yacht-Club-Argentino-Mar-del-Plata-Buenos-Aires-