Istanbul is Turkey's largest city and was previously known as Constantinople and Byzantium. The city is served by Istanbul Ataturk Airport and Sabiha Gokcen International Airport. Istanbul Ataturk Airport is the 11th busiest airport in the world. Sabiha Gokcen International Airport is named after Sabiha Gokcen, Turkey's first female combat pilot.
Cheap flights from Istanbul leave at either Sabiha Gokcen International Airport or Istanbul Ataturk Airport. To fly from Istanbul to London, your plane will depart from one of these two airports. Sabiha Gokcen Airport is 35 kilometers from downtown Istanbul, whereas Istanbul Ataturk Airport is 24 kilometers away.