Finding flights to India is as simple as entering your information into any one of the dozens of airfare sites out there, but finding discount flights to India can be a bit trickier. Unless you are in Thailand or in that region, chances are this is going to be an expensive plane ticket no matter what.
The best place to start is to look for flight into Mumbai, since this is the largest city and has the most frequent service. If you want to go to Goa it’s usually cheaper to fly from your city into Mumbai and then take the train the rest of the way. You can also buy flights on discount airlines to Goa, but the train will always be cheaper.
The problem with this Mumbai train idea is that it takes about 12 hours to get to Goa, and unless you reserve a good sleeper cabin on the train this can feel more like 12 days. The flights are more expensive, but if you factor in the whole day you spend on the train they really are a better alterative for most people.
If you are coming to India from the east then flying into Delhi is usually your best bet. From there you can take a discount airline to Goa, but forget about the train because that takes almost two full days and it’s just not worth it.