American Airlines has low $83.10 one way fares between Las Vegas and Philadelphia for travel primarily in April and early May. Spirit and Frontier offer most of the low one-way fares between the coasts right now, but there are routes with competition from AA, DL and UA. AA has low fares of $83.10 on this route and United Airlines has $87.10 fares.
American Airlines Las Vegas LAS – Philadelphia PHL (nonstop)
$166.20 round trip Tuesday April 5 – Sunday April 10
LAS-PHL-LAS = 4,352 flight miles for AAdvantage miles.
United Airlines Philadelphia PHL – Las Vegas LAS
$178.70 round trip Tuesday May 3 – Saturday May 7
United Airlines base ticket price = $138 for Mileage Plus miles calculations.