Goldenshield is right; most fares won't permit combinations of different rates to permit a true "open jaw" itinerary unless the route is a legal
To be a "legal" open jaw, the open (un-flown) leg must be shorter
than either leg that is actually flown.
So for example:
This would be a legal open jaw, since the unflown SEA
distance is much shorter than either the LAX
flown portions. Trying to buy a ticket on this kind of route would basically end up getting you an inexpensive excursion fare.
This would not
be a legal open jaw, since the unflown LAS
distance is much longer than the SEA
flown portion. Trying to buy a ticket on this kind of route would likely give you two one-way fares, which can be pretty spendy. The cheap excursion fares would not apply.
"In this present crisis, government is not the solution to our problem - government IS the problem." - Ronald Reagan
Comments made here are my own and are not intended to represent the official position of Alaska Air Group