I am an Indian Student studying in Adelaide, can anybody tell me that which is the cheapest flight from Adelaide or Melbourne to Kolkata(India) at the time of December. I know that Jetstar and Tiger Airways run cheaper flights from Australia but they don't have any direct flight to Kolkata, that's why I have to take a connecting flight from Singapore or Bangkok. So which is the best and cheapest route for me and also tell me that, I need any Visa for collect my baggage from Changi or Suvarnabhumi Airport's Arrival lounge and getting another Airline's flight from the Deaperture lounge, also tell me the cheapest return route from Kolkata to Melbourne or Adelaide at the middle of January.