Frontier Airlines, an ultra low-cost, no frills airline is having a Buck Fare sale where one-way fares start from $20. In a separate thread, I have SFO-LAS for $39 RT, nonstop. In my opinion, short hop trips are fine and doable on Frontier.
Buy by 6/26/18
Fly 6/28 - 9/15/18
*Fare shown is one way for domestic, nonstop travel on specific dates in select markets. Seats are limited. Restrictions apply.