Southwest Airlines is having a daily deal today only, April 24, 2009, where you can receive 50% off a roundtrip airfare from any Southwest-departing city to Philadelphia.

This 50% discount is valid for use at southwest.com or swabiz.com.  7-day advance purchase is required. You must purchase your ticket today, April 24, by 11:59 pm Pacific Standard Time. Your travel must be between May 1 through June 10, 2009, not including the blackout dates of May 21-May 25, 2009. This discount does not include taxes and fees, and roundtrip purchase is required.

This 50% discount is only valid with the provided Promotion Code, which for today is LUVPHL.  You can access this great deal by going to the Southwest Airlines website at southwest.com.