Question : How long do most people stay in Seattle when they fly in from Zagreb?
Answer : Of course you're not most people, but if you were, you'd stay roughly 31 days.
Question : Is price more important than specific travel days for you?
Answer : For the month of February, the cheapest day to fly is Wednesday. Flexibility is paramount when booking travel plans in order to keep costs down.
Question : Which airline is offering the cheapest round-trip flight from ZAG to SEA?
Answer : Check out United Airlines, as they have been booking customers at lower fares than most.