Delta Airlines has announced a temporary reduction in the number of Skymiles needed for over 8,000 domestic routes. A partial listing of the routes is on this webpage. Other, unlisted routes are also on sale, and they can be found by beginning a booking on the Delta website and seeing the number of Skymiles frequent-flyer miles needed.
Big Award Travel Ticket Sale on Delta
Shawn Coomer’s analysis can be found here: http://frequentmiler.boardingarea.com/2016/05/12/delta-award-sale-2
Lucky’s (skeptical) analysis can be found here:
There are some caveats: You have to purchase by June 7, you have to purchase at least 21 days prior to travel, and the reduced fares are for travel from August 23 to November 16. (If Labor Day travel is in your plans, I would advise booking ASAP.)
The discount covers Main Cabin (Economy, Coach) and Delta Comfort+ seats. An example is Atlanta to Austin for just 7500 / 11,500 SkyMiles, another example is Detroit to San Francisco for just 11,000 / 15,000 miles. Note that these are one-way fares, and the return fares are likely to be higher.