You can fly round-trip from LAX to Tokyo's Narita airport for $659 round-trip, including all taxes and fees, on Singapore Airlines.
The nice thing about this fare: The booking window is open until Dec. 31.
The fare, of course, is subject to availability. It may be scarce during cherry blossom season (March 23-April 2 this year) and during peak summer and holiday dates.
Other airlines may start matching this fare so if you can't find it on Singapore, look elsewhere, Airfarewatchdog tells us.
Info: Singapore Airlines, (800) 742-3333,
Source: Airfarewatchdog