New Delhi and Mumbai has various daily flights for Athens. Qatar Airways, Jet Airways, Emirates, Etihad, Egypt Air, Turkish Airlines offer services to Athens. From there, you can take flights or ferries to reach Santorini.
Santorini national Airport situated in the village of Kamari provides daily flight connections from nearby Athens and places all over Europe. There are regular flights from Athens by Olympic Air, Aegean Airlines, and AirSea Lines. During summer, connections for Crete (Heraklion), Rhodes and Mykonos are also provided. In July and August Astra Airlines flies from Thessaloniki.
Frequent ferry from Piraeus port in Athens are available which connect Santorini to the new port of Athinios. There is also a daily connection between Heraklion (Crete) and Santorini during high season. The trip from Piraeus to Santorini takes 4.5hrs with a high-speed ferry.