Question : What is the cheapest day to fly in the next four weeks?
Answer : Since low prices are preferred, look at Mar 1st. As of Feb 20th, it's showing the cheapest ticket sales at $1,006. That is 22% below the average price for this route, so you can spend that extra cash on an adventure in Seattle.
Question : What price range should you expect when booking from Karachi (KHI) to Seattle (SEA)?
Answer : Ranging anywhere from $972 to $3,335, prices for KHI to SEA do fluctuate much more than most routes from Pakistan. Prices tend to be lower the further out you book.
Question : How long do most people stay in Seattle?
Answer : Of course you're not most people, but if you were, you'd stay roughly 36 days.
Question : Is price more important than specific travel days for you?
Answer : Friday is your cheapest day to fly in March. Being flexible with your travel days garners even more savings during booking.