$427 roundtrip flights US to Tokyo

There's a sweet sale going on right now on March, April, and May flights from the US to Tokyo.
Note that this is with real fancy airlines like Delta and United, so you can probably check bags for free and get a massage or whatever it is fancy people do on fancy airplanes.

The cheapest fares seem to be from Chicago ORD ($427ish) and LAX ($436ish), but there are some good deals all over the country. Use Google Flights and the Calendar or Flexible Dates feature to find the best deals. Thanks to The Flight Deal for the tip! (Note that although The Flight Deal says that this is a Delta Airlines sale, the majority of the cheap flights seem to be United. Google Flights will help you find the perfect flight for you!)