Flying vs Busing is typically a numbers game. Anecdotally, teams smaller than 20 fly, larger teams are cheaper to bus. Over 14 hours of busing? You'll probably fly regardless of cost.
Not sure if you qualified and want to price it out? You might want to call Southwest and get a quote for a refundable vs non-refundable ticket.
https://www.southwest.com/html/air/b...up-travel.html
Also call your school recommended Charter Bus and get a quote.
Planning for this in advance does make it easier to fundraise....