Just doing a little surfing today (cold and snowy here but not as bad as what those of you in the North East are experiencing).
For discussion purposes, here are a few airline fares I found, using June 3rd-7th as an example.
Louisville to Phoenix $140
Portland, Maine to Phoenix $348
Providence, RI to Phoenix $248
Chicago to Phoenix $291
Seattle to Phoenix $262
Indianapolis to Phoenix $191
St. Louis to Phoenix $178
Atlanta to Phoenix $387
Anchorage to Phoenix $658
New York to Phoenix $358
Boston to Phoenix $252
Charleston, SC $289
San Francisco to Phoenix $184
Charlotte, NC $147
Portland, Or to Phoenix $262
Tulsa, OK to Phoenix $168
Denver to Phoenix $158
