For our Sufi Trail Parendes (travelers) we have some details to consider.
There are two airports in Istanbul, one is on the European side and the other in the Oriental part.
Istanbul Airport – website
The biggest airport in Europe and recently opened.
Sabiha Gökçen Airport – website
VISA – website
When you travel from Europe you do not need a visa, we advise this link if you do need a visa. It is the cheapest and has easy payment options.
How to get to Eyüp Mosque or Ferry to Yalova
IDO ferry boat
When you arrive there are many options to check your public transport to Eyüp Mosque, Sufi Trail starting point or directly go to the IDO ferry boat to go to Yalova, There are two ports, Yenikapi and Pendik.
Yenikapi is closer to Istanbul airport and Pendik to Sabiha Gökçen Airport. Yenikapi is however easier for starting the Sufi Trail, as it is on the Sufi Trail when you arrive in Yalova.
There are many websites that give up to date information here are 3 examples:
1 Type in google: www.google.com
For example type: Istanbul airport to Eyup | press enter | and choose the public transport icon, the result will be:

2 Rome to Rio: www.rome2rio.com
3 Istanbul insider: theistanbulinsider.com
Websites that explain the options from both airports:
3A from Istanbul Airport
https://theistanbulinsider.com/how-to-get-from-the-new-istanbul-airport-to-taksim-or-sultanahmet/
3B from Sabiha Gokcen
https://theistanbulinsider.com/how-to-get-from-istanbul-sabiha-gokcen-airport-to-taksim-or-sultanahmet/