There's no train connection with Milas Bodrum Airport.
Car and bus
The airport is situated 36 kilometers northeast of the seaside resort Bodrum and 16 kilometers south of Milas. The airport is easily accessible by rental car. From Bodrum you follow the freeway to Milas (D330). The exit to the airport is clearly signposted. Traveling from the airport to Bodrum takes about 45 minutes; to Milas 20 minutes.
The company Havas maintains a shuttle bus service between the airport and some popular hotels in Bodrum.
Car rental Bodrum Airport
You can find counters of car rental companies in the Arrivals Hall. Several rental companies are present at Bodrum Airport, including local providers and international ones such as Avis, Budget, Europcar, Hertz, National and Sixt. You can also book a rental car in advance using the service provided by EasyTerra; they compare the rates of several providers in a single quote.
You can find taxis outside the Arrivals Hall. The (fixed) rates to various destinations are clearly indicated on a sign. A taxi to Bodrum costs € 45, to Kusadasi € 85. The official currency in Turkey is the lira, but the drivers also accept €.
There's an open-air parking lot outside the terminal. There are no separate places for long-term parking; nobody leaves his car here at night.