British Airways offer daily flights to Istanbul from Heathrow Airport, with costs for economy class starting at around £100 one-way. Other companies that offer services are the Turkish national airline Turkish Airlines (TK), Austrian Airlines, Lufthansa and Swiss.

Approximate flight times from London to Istanbul are three hours and thirty minutes, with the city’s airport Ataturk (formerly Yesilkoy) offering regular coach services and taxi rides into the city, which lies 24km and a thirty to fifty minute ride away. The other international airports, including Ankara, Izmir, Sabiha Gokcen, Adana, Antalya, Dalaman and Trabzon all offer similar services, with buses and taxis available for rides to their respective cities, along with shops, bureau de changes, ATMs, car hire services and restaurants.

www.turkishairlines.com  

http://www.turkeytravelplanner.com/Transportation/Air/MajorAirports.html