Travelocity often bends fare rules when doing multi segment trips.

Example:

If I need to fly LAX-DEN without a sat night stay, I plug in the dates, and then plug in a third segment (say, LAX-LAS) a week later. Voila! A discount fare.

And I will always make sure I need and take that third segment.

How do I get back? Same kind of logic. LAS-LAX on one day, LAX-DEN-LAX another.