"I am not able to announce at this time any date. Our target is mid-December," Ban told reporters during a visit to Lithuania.
He said UN-Arab League envoy Lakhdar Brahimi will try to set the date in a meeting with Russian and US representatives on November 25.
"They will review and, if possible, I hope that they will be able to set a date so that I can issue a statement," Ban said.
The international community has been trying for months to bring government and rebel representatives to the negotiating table but proposed dates have come and gone with no progress.