Does anyone know the best websites to look for the cheapest open jaw airfares?
As noted, go to any travel site and select the multi-city search option.
FYI, an open-jaw is defined as a trip where you begin and end your trip in one city but arrive/depart from different ones. A good example is that last summer I flew Portland to Rome and then from Paris back to Portland.
Any travel web site will provide open jaw fares. I don't know anyone is really best. Look at several and then the airline itself.
I use kayak.com
I've used farecompare and then gone directly to the airline website to book with their "multi-city" option.
I have had good success with priceline.com. i booked seattle to Paris and return from Rome to Seatlle for $600.