What is the Cheapest way to rent a car in Portland and return it in San Fran? I see all types of great rates you can bid on, however they are all pick up/return in same location (We would love a convertible but,do not wish to rent a car for 2 weeks for $600). I am also looking for the best way to get ONE WAY airfare's for cheap. Due to it not being ROUND TRIP TICKETS, the price bumps up big time.