From Helsinki Airport
Direct buses to Turku depart from Helsinki Airport once an hour most of the day. Tickets cost from 10 to 30 euros. You can purchase tickets and find more information at https://matkahuolto.fi/en/ and http://www.onnibus.com/EN/index.htm.
From the airport you can take the train to Helsinki central station or to Pasila station and transfer there to a train to Turku. Tickets cost approximately 20 euros. For further information, please visit the website at https://www.vr.fi/cs/vr/en/frontpage