Getting to Mar del Plata
Be sure to also check the wiki page about this topic!.
New: Ezeiza airport guide
If you are coming to argentina by plane you will be arriving to Ezeiza airport, but flights to Mar del Plata leave only from Aeroparque Jorge Newbery. Manuel Tienda Leon has buses covering Ezeiza-Aeroparque every hour, starting at 9:00 and until 00:40 in both ways. The ride takes about one hour, and it costs approximately 14€.
Aerolineas Argentinas has two daily flights in both ways on weekdays and only one on weekends, connecting Aeroparque Jorge Newbery and Mar del Plata. Departure times from Buenos Aires are aproximately at 7:00 and 20:00, and from Mar del Plata at 9:00 and 21:00. The cost is 74€ on tourist class, and the flight lasts about one hour.
Government info about travelling to Argentina.
If you want to arrange with other people for taking the bus, add your name in the wiki page.
There are 8 daily regular trips leaving from Ezeiza airport to Mar del Plata offered by Manuel Tienda Leon for around 37€ round-trip, and it lasts about 6 hours.
Buenos Aires-MDQ and MDQ-Buenos Aires departure times are:
It is posible to make a reservation sending a mail to firstname.lastname@example.org.
Source: Tienda Leon MDQ