See the sticky post at top - as information is hard to understand.
But let me try:
You need 1,038 miles (not 1,000 - big difference).
You are not denoting if you are already an Elite or not - so not sure if 500 mile minimums are in effect.
I assume you're free to fly from PHL, MDT, ABE, BWI, or even EWR - and all dates from tomorrow onwards (for a one-day MR) are free.
Results:
Tomorrow (and Tuesday): ABE-PHL-DFW-PHL-ABE. $318.
December 26th: EWR-CLT-IAD-CLT-EWR. $342.
December 29th: PHL-CLT-ATL-PHL. $248.