Bilkent University is in the western suburbs of Ankara, about 10 km from the city center. Fly directly into Ankara from a European city. In June Lufthansa has two daily flights from Frankfurt to Ankara. Austrian Airlines flies a few times a week from Vienna, and Alitalia flies on Saturdays from Rome. Flying directly to Ankara is strongly suggested.
All major airlines have lots of scheduled flights into Istanbul.
After clearing through immigration and customs, you can switch to the domestic terminal and fly into Ankara with Turkish Airlines. You can purchase your domestic tickets from your travel agent. You can also take cab to the intercity bus terminal in Istanbul and take a bus to Ankara. There are buses every hour or more frequently. Both have certain services where either the lower deck is nonsmoking or the whole bus is nonsmoking.