As widely predicted, Delta is eliminating stopovers on its awards starting January 1, 2015. Its SkyMiles program rules page says as much.
This is a bummer, but the good news is that one way awards will be bookable with Delta miles starting January 1, 2015, and Delta has already improved its online search.
American eliminated stopovers on awards this year, and the US Airways program will cease to exist in quarter 2 of 2015, which means United will be the only American program that allows stopovers very soon. We’ll see how long that lasts.
Your last chance to book a Delta award with a stopover will be December 31, 2014. At that point, you can book an award through about November 2015.
Hat Tip: Lisa in the comments