Question : What day in the next four weeks has the best fares?
Answer : Since low prices are preferred, look at February 7th. As of January 16th, the cheapest ticket sales are coming in 51% below the average price for this route, so you can spend that extra cash on an adventure rather than the flight.
Question : How many days should you spend in Zurich if you're flying in from Pittsburgh?
Answer : Of course you're not most people, but if you were, you'd stay roughly 10 days.
Question : Is price more important than specific travel days for you?
Answer : In February, Thursday is your lowest-cost day to fly. Having flexibility in your travel plans means you can save, so be sure to plan ahead when possible.
Question : How often are prices changing for this route?
Answer : Flight prices for PIT to ZRH change a lot more than most routes. Prices tend to be lower the further out you book.