How to Find Cheap Flights to Europe

Since living in Germany, flying to America and back has been a priority for me so I can still see family and friends.  However, if I had to pay $1,500/ticket each time, it would not be feasible to travel as often. Thankfully, I've found a way to get to America and back to Germany (and other parts of Europe), for just $350 round-trip. Too good to be true?