Lately I have found some decent one way fares on certain routes. My next itinerary is

6 Jun SFO-DEN UA 1584 $269
10 Jun AA DEN-DFW-IAH 1988/831 $258

Another one way on UA SFO-DEN the same day was in the neighborhood of $750, and SFO-IAH on CO was $624.

The same itinerary on HP (SFO-PHX-DEN-PHX-IAH) was in the $900 range. Often, they are the least expensive for trips without a Saturday night stay.

Go figure. It does pay to shop around.