Novi Sad Central Bus Station

Belgrade Airport to Belgrade Bus/Train Station: 
Belgrade "Nikola Tesla" airport is 15km away from the centre of Belgrade. There are two places you can get on the bus: one is next to Terminal 1 entrance and the other is in front of the Arrivals entrance.

Belgrade Central Bus Station to Novi Sad: 
Buses run every 15 to 45 minutes and the journey takes an hour and a half.

Belgrade to Novi Sad: 
Every 15 to 45 minutes from 03:00 to 23:59 
Novi Sad to Belgrade: Every 15 to 45 minutes from 5:00 to 23:59 
Price:  from 6 - 8 euros (but you will have to pay in Dinars - 600 - 800 Dinars)

With this type of travelling, these numbers may be of use to you: