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 one week.
Question : Can you cut down on flight costs by changing the day of the week you travel to Krakow?
Answer : For the month of March, Wednesday is your cheapest day to fly. Having flexibility in your travel plans means you can save more, so be sure to plan ahead when possible.