My wife and I are planning to go to Germany in September to visit my sister and brother-in-law in Stuttgart. Our current idea is to leave Friday evening and return the following Saturday. We live in Northern VA, so Dulles, BWI, and Reagan are all easily accessible to us.

Does anyone have any advice on when to book our flights? Will I get a better deal if I book now, 7 months out, or wait till the time draws closer?