There is an amazing sale on American/US Air flights from Philly to Las Vegas and a couple more west coast cities. This super duper deal may not long last so if you have never been to Vegas you can escape there for just $36 from Philly. You can use Google Flights to see all available dates. Below is a random search I performed for August 29th and results are below –
I am seeing availability on several days from August thru November but again this super sale may not last long.