Question : If your plans are flexible, have you considered changing your departure day?
Answer : The cheapest day to fly in May is Sunday. Flexibility is paramount when booking travel plans in order to keep travel costs down.
Question : Is the price you found a good deal?
Answer : Prices for this trip tend to change a lot more than other flights from the United States. They can vary anywhere from $923 to $4,258. Prices tend to be lower the further out you book.
Question : What day in the next four weeks has the best fares?
Answer : Since low prices are preferred, look at May 14th. As of Apr 17th, it's showing the cheapest ticket sales at $1,059. That is 51% below the average price for this route, so you can spend that extra money on an adventure rather than the flight.
Question : How long do most people stay in Krakow?
Answer : Of course you're not most people, but if you were, you'd stay roughly 15 days.