Can anyone suggest a good tour group for a ONE DAY tour, leaving from Istanbul? It's in the middle of December. I'm having a hard time discerning who is legitimate. We'll need to fly from Istanbul that morning.
Check out toursbylocals.com. They have quite a few tours. We’re looking at a day tour to Ephesus on their website. Trying to decide if it’s worth the time and cost.
They only do tours if you are already there, not from Istanbul. I hope you do go to Ephesus. It looks fascinating.
SRM Travel is the company RS uses for guides in Turkey. They offer tours to Cappadocia but you would have to ask about whether they could do just one day https://www.srmtravel.com/CR-Cappadocia.html
IMHO, it is worthwhile to stay at least one night there. By the time you get to the airport, through security, and fly (1.5 hours each way), you won't have much time to see the sights before you need to go right back.