[07/24/2015 @ 9:08 PM] Lots of availability now, including weekend flights. Expect prices to fluctuate between $137 to $164.
[08/05/2015 @ 12:43 PM] Most cheap departures are only on TUE/WED now. Returns can happen on most days of the week still.
[08/07/2015 @ 7:33 PM] Removing from deal list until more availability comes up. There are a few scraps left, but not enough to be useful to most people.
American Airlines is offering NONSTOP flights from Dallas (DFW) to Philadelphia (PHL) for $164, round-trip. Flights most days of the week from late August to October. Fare is reversible.