Okay here is what you may have to do some times. I was trying to find a cheap ticket (under $400) to go to Philly for my Jefferson interview and searched online almost everywhere. The tickets were like $1,000 😱 because I was leaving on a Tuesday and coming back the next day (you know how it is with classes and all) soooo, I checked with Southwest to fly into BWI and then I can drive to Philly (only about 100 miles) and the ticket was $160.00 hellooo?? much much cheaper. So you may want to check were SW goes from St. Louis and go from there, you may have to rent a car but it can still be a lot cheaper.