How to Buy Tickets...
Because of the way international airfares are structured, it is usually far cheaper to purchase your Turkish domestic flight tickets on the Internet, or within Turkey, or in advance through a good Turkish travel agency, rather than in your home country. Here's proof.
A good Turkish travel agency can make your flight reservations for you, and send you the electronic ticket info, usually at no charge to you. Here are my recommended travel agencies.
The farther in advance you buy your ticket, the cheaper it is likely to be.
It's possible to buy low-fare tickets in English on the websites of AnadoluJet, Onur Air, Pegasus Airlines, Sun Express, Turkish Airlines, and several others.
Sun Express, a Turkish-German joint venture, flies from many European countries to Turkey, and within Turkey from İzmir's Adnan Menderes Airport to Adana, Antalya, Diyarbakır, Erzurum, Kayseri
(for Cappadocia), Konya, Trabzonand Van. More...
Turkey's International Airports
Most long-haul international flights land at Istanbul's main International Airport (IST), but Sabiha Gökçen Airport, on the Asian side of Istanbul, is the fastest-growing airport in Europe, so you may land there instead.
See my Major Airports in Turkey and Turkish City Airport Codes.
Plane? Train? Bus? Car?
Flying used to be expensive in Turkey, but now with numerous airlines competing for domestic passengers, fares have fallen and are sometimes not much more expensive than the train or bus.
In Istanbul you may prefer a value-for-money private transfer service from either airport (Istanbul Airport or Sabiha Gökçen) to the city center because it's far superior to a taxi, and not much more expensive; and if you have 3 or more people with luggage, it's definitely the way to go. More...