Question : How often are prices changing for this route?
Answer : Flight prices for RDU to GFK fluctuate a lot less than most routes. However, the sooner you book, the better price you tend to get.
Question : How long are most people's visits to Grand Forks when they fly in from Raleigh?
Answer : Of course you're not most people, but if you were, you'd stay roughly four days.
Question : Is price more important than specific travel days for you?
Answer : For the month of December, the cheapest day to fly is Saturday. Flexibility is paramount when booking travel plans in order to keep costs down.