There is no airport in Ios. The closest airport is on Santorini, in the Cyclades, the most popular tourist destination in Greece. The airport of Santorini receives daily flights from Athens and the flight time is 40 min. In summer, it also receives flights from Thessaloniki.
Moreover, the airport of Santorini operates charter and low-cost flights from Europe in tourist season. From the port of Santorini, there are almost daily ferries to Ios island.