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An Istanbul airport cab to the city center does not have a defined price. Instead, a taximeter will compute your journey depending on the distance traveled. During the day, the total cost will be approximately 30, and at night, it will be around 35. However, because to Istanbul's heavy traffic and additional fees for things like waiting time and luggage, you may wind up spending considerably more. Booking your Istanbul airport transfers in advance is the only way to get the assurance of a flat rate price.
https://www.istanbul-airport.info/taxi-transfers.html