Question : Do travelers from Roanoke typically stay in Portland for very long?
Answer : Of course you're not most people, but if you were, you'd stay roughly 12 days.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : Sunday is your lowest-cost day to fly in December. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : How often are prices changing for this route?
Answer : Prices for ROA to PWM do fluctuate a lot more than most routes. The further out you book a route, the more likely you are to save.