Competition is picking up going into the fall travel season. United and Us Airways are at it this time offering $99 round trips from Phoenix to San Fran (and vice versa).
You can also book Phoenix to Denver for $98 round trip on Southwest. The major pro with Southwest is that you can change your flight/date with no penalty. Remember, Southwest flights can only be shopped for on Southwest.com
You only need 2,338 Southwest points for a one way!
There are some other really good deals out there too! You can fly from Long Beach, Ca, yes there is a commercial airport there, to the east coast for $103 one way! One way to New York, Washington DC, or Fort Lauderdale, for around $100. Check out the best options using google flights