Traveling with the bus:

Long distant autobuses timetable

Bus schedule Athens Kalamata http://www.athensinfoguide.com/nl/busTT.htm

Bus schedule to Stoupa and f.i. Ag.Nikolaos
Express- (ΕΞΠΡΕΣ)
The journey takes about 3 hours, and the regular bus about 4 hours from Athens to Kalamata or vise versa
(Εκτός ΣΑΒΒΑΤΟ = not os saturday).

It is also possible to take a taxi from Kalamata.