There are several airlines (Virgin America, Jetblue, Alaska Airlines, United) that have limited flights available flying to and from San Francisco (SFO) and Las Vegas (LAS) for $29 One-Way. It may be hard to find a roundtip for $58 because the return trip on the same airline may not be available. You will most likely have to book two separate one-way tickets.
Departs SFO: Feb 22, 28; Mar 1, 7, 8, 14; April 18, 19; May 2, 3, 9
Departs LAS: Feb 22, 28; Mar 1, 7, 8; Apri 18, 19, 26; May 2, 3, 9
Book it on Virgin America , Jetblue or United . Best availabilities are on Virgin and Jetblue.