Originally Posted by
zahidworld
Hi
I took this photograph in April and this may help someone.
There is no longer a HAVAS bus to Sultanahmet. The closest terminus is Aksaray, from where you can take a taxi or the (likely jam-packed) tram.
A slightly more complicated, but more relaxed way might be the bus to Taksim - use the underground metro walkways that take you to the lift down to the tram terminus at Kabatas. From there a tram to Sultanahmet (though you might find the stops immediately before Sultanahmet useful).
You need an istanbul card for the public transport options following the Havaist ride.
https://www.hava.ist/en/Voyage/VoyageTime