Southwest Airlines is offering a one-day only deal, where all flights into and out of Philadelphia are half priced between May 1st to June 10th. Luckily enough, this lands in perfect time for the USMNT game in Chicago. I got my roundtrip ticket, leaving June 6th early in the morning and returning early July 7th, for $135. Lands in Midway at 10am... I recommend, if anyone was on the fence and near Philly (like I was) to go for it.