Question : What day in the next four weeks has the best fares?
Answer : Since low prices are preferred, look at Feb 24th. As of Feb 20th, it's showing the cheapest ticket sales at $851. That is 3% below the average price for this route, so you can spend that extra cash on a fun experience in Grand Forks.
Question : Do prices fluctuate more for this route than others?
Answer : Ranging from $851 to $921, prices for SJU to GFK change a lot less than the majority of routes from Puerto Rico. Prices tend to be lower the further out you book.
Question : How many days should you spend in Grand Forks?
Answer : Travelers from SJU to GFK stay about one week on average.