As an example, I found seats departing Phoenix PHX on Saturday, August 31, returning from Seattle SEA on Tuesday, September 3, 2019.
This fare includes a carry-on bag plus one small personal item. A checked bag costs $30 each way.
Standard seat selection is included in this fare.
Alaska's Saver fare is $30 less, which comes to $197 roundtrip for these same dates, which includes limited seat selection but is in the last boarding group. First checked bag fee is the same $30 each way.
Don't be sleepless in Seattle. Here's what's available for the long weekend dates on Hotelwatchdog.