[US or AA] PHX to PHL - Sept/Oct
2-day PHX to PHL and back 6970 miles for $367 -- 5.26 cents/mi
DAY 1
PHX to LAS non-stop
LAS to PHL via DCA
DAY 2
PHL to LAS via LAX
LAS to PHX via LAX
Can all be done on 1 PNR for less $ than if you book the PHX/LAS and LAS/PHL separately. Price varies by day ... check the <usairways.com> flexible date booking engine for the LAS/PHL portion to find least expensive days.
Plenty of connection time for all changes.