Question : How long do most people visit Madrid?
Answer : Of course you're not most people, but if you were, you'd stay roughly 15 days.
Question : How much should a trip from Curitiba (CWB) to Madrid (MAD) cost?
Answer : Ranging anywhere from $852 to $2,984, prices for CWB to MAD do change much more than most routes from Brazil. However, the sooner you book, the more you'll be able to save.
Question : Looking for the cheapest flight over the next 30 days?
Answer : Since low prices are preferred, look at Jun 6th. As of May 22nd, it's showing the cheapest ticket sales at $852. That is 43% below the average price for this route, so you can spend that extra money on an adventure rather than the flight.
Question : Will you do what it takes to get the absolute lowest-cost flight?
Answer : The cheapest day to fly in June is Tuesday. Flexibility is paramount when booking travel plans in order to keep travel costs down.