Delta has some weekend fares online right now, but some of them are only available through Orbitz. You must travel Saturday December 13 and return by Monday December 15 or Tuesday December 16. Here are some fares found online:
**Sat Dec 13 - Mon Dec 15: New York (LGA) - Tampa (TPA), $166 non stop through Orbitz. If you were to go to Delta's site their lowest fare is $219.
**Sat Dec 13 - Mon Dec 15/Tue Dec 16: Philadelphia (PHL) - Atlanta (ATL), $159 non stop.
**Sat Dec 13 - Mon Dec 15: Salt Lake City (SLC) - Los Angeles (LAX), $166 non stop.
**Sat Dec - Mon Dec 15: Boston (BOS) - Ft. Lauderdale (FLL), $186 non stop.
Plenty of other cities involved in this sale. You must purchase by December 13. Check out Delta Airlines for more details, terms and conditions.