Istanbul Airport (IST)
On the European side of Istanbul, you'll find Istanbul Airport. It's the main international airport in Turkey, handling large amounts of domestic traffic daily. As a major hub for Turkish Airlines (the flag carrier), it offers many connections to most major Turkish cities as well as tourist destinations in the country.
Sabiha Gökçen International Airport (SAW)
Sabiha Gökçen International Airport, situated on the Asian side of Istanbul, is another major transportation hub for Turkey. It's primarily served by low-cost carriers like Pegasus Airlines, AJet and SunExpress, making it a good option for budget-conscious travellers.
Esenboğa International Airport (ESB)
This is the main airport of Ankara, Turkey's capital city. It's currently a hub for Turkish Airlines and AJet, with a broad range of domestic and international routes.
Adnan Menderes Airport (ADB)
Near Izmir, you'll find Adnan Menderes Airport. It's gained its title as the third-busiest airport in Turkey from the abundance of domestic routes it offers, including connections to major cities in Turkey and tourist hotspots. Turkish Airlines and SunExpress primarily operate out of this airport.