$430 from the U.S. to Japan with Hopper
If you fly with United Airlines and use the app called Hopper,http://www.hopper.com you can score some amazing round trip fares to Japan from the United States. Return fares are as low as $430 for travel this spring.
Hopper, which was voted the best mobile travel app by Apple last year, is also a good way to obtain lower prices on flights in general. I can't tell you much more about it, unfortunately, because while I do have a smart phone I have not used it for travel booking. Call me old-fashioned, but I don't trust mobile technology that much.
However, if you are adept with the mobile thing, this could be a good year to book that trip to Japan to view the cherry blossoms.