Question : How many days should you spend in New York if you're flying in from Hamburg?
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 : For the month of December, the cheapest day to fly is Friday. Being flexible with your travel days garners you even more savings during your booking.
Question : Who's offering the cheapest round-trip flight to John F. Kennedy International Airport (JFK) over the coming months?
Answer : KLM is your best bet for finding that coveted low fare.