From the “ELEFTHERIOS VENIZELOS” airport in Athens, you may fly to Santorini using one of the following airlines: Olympic Airlines and Aegean Airlines.
The flight should last about 45min depending on weather conditions and required route alterations (in some cases you make a stop on another island before you get to Santorini).
There are various charter flights to Santorini as well. Those usually start in April and end in October. For more information contact your local travel agent.
Some of the airlines that fly directly to Santorini from abroad are
Excel Airways, Thomas Cook, etc. Santorini National Airport is located in the southeastern part of the island, near to Kamari and Nemely Center!