Question : How long do most people stay in Prague when they fly in from Fairbanks?
Answer : Of course you're not most people, but if you were, you'd stay roughly 10 days.
Question : If your plans are flexible, have you considered changing your departure day?
Answer : For the month of February, the cheapest day to fly is Saturday. Being flexible with your travel days garners you even more savings during your booking.
Question : Are prices changing frequently for this route?
Answer : Prices for FAI to PRG do change much more than the majority of routes. The further out you book a route, the more likely you are to save.