Your transfer from Heraklion Airport to Rethymno can be easily done by a taxi transfer. The distance from Heraklion Airport to Rethymno is about 80 km and the time that a taxi needs is about 1 hour and 15 minutes for the transfer, while the bus takes about 2 hours and 30 minutes. The taxi station is outside the airport. Also, there is a city bus station just outside the airport. If you choose a taxi for your transfer to Rethymno it would be better to have booked a transfer taxi earlier so that the taxi driver can pick you up immediately upon arrival and don't wait in line, in case that there is no available. If you choose the bus for your transfer to Rethymno, you will have to take the city line outside Of Heraklion Airport and then to go to the intercity bus station located near to the port of Heraklion. Also, you have to know that the bus routes are adjusted according to the season each time. So, the faster way for your transfer from Heraklion Airport to Rethymno is a taxi which you can find either outside the airport or by booking earlier your private transfer so you don't have to worry about anything for your trip.