transport by road ?
For the arrivals from Dalaman Airport:
Either you can take a taxi-cab direct to Datça or you may take the Havaş service from the Dalaman Airport to Marmaris and switch to a midibus from Marmaris which takes off from the station every hour to Datça. By your private car, its easy to get Datça by using Muğla-Marmaris double-lane road.
After you reach to Marmaris by using Aydın highway over İzmir, there remains only 1 hour driving distance. And it takes approximately 60 minutes from Marmaris to Datça by car.
There are also direct bus transportation from big cities like İstanbul, İzmir and Ankara.
transport by air and sea ?
You can fly to Bodrum Airport and from there you can take ferries from Bodrum to Datça. There are two regular voyages, one in the morning and one in the afternoon, from Bodrum to Datça and vice versa during April till November .
Datça - Marmaris : 70 kms
Datça - Bodrum : 1 hour by ferry
Datça - Ankara : 825 kms
Datça - İstanbul : 882 kms
Datça - İzmir : 342 kms
Datça - Simi & Rodos : 3 days by ferry