Great deal between Philly and Las Vegas! Nonstop travel only on US Airways.
The fare seems to be good through March 12, 2014.
Must purchase 7 days in advance.
For you mileage runners, the CPM can get as low as 2.9 with same day turns available!
How To Find The Fares
I found these flights using ITA Matrix monthly search.
Once you have your dates, enter them into Hipmunk and it will link you to usairways.com where you can finish booking. You can always go directly to usairways.com but I always find Hipmunk easier to work with.
Hat tip to flyer777lr on Flyer Talk.