There is no airport in Sikinos island. The nearest airport is located in Santorini island, the most popular destination of Greece, that receives daily flights from Athens and charter flights from abroad in summer.
To get a better understanding of the island's location, view the Map of Cyclades.
Alternatively, you can arrive in the airport of Athens and then take the ferry from Piraeus port to Sikinos island. There are ferries 3 times a week from Piraeus to Sikinos and the trip takes about 10 hours.
Also, visitors can reach the island of Sikinos by ferry. There are some ferries to Sikinos from Piraeus port in Athens.