Note: Availability may be limited based on select dates of travel. Sale fares with departs from mid October, 2016 with return dates thru mid November, 2016.
Editor's Notes & Price Research
Priceline on Singapore Airlines have a somewhat last minute-type fare (considering this is International travel) to/from LAX-NRT for $446 roundtrip, nonstop, all taxes included deal.
Note: I suggest you make sure you have a valid US Passport now before booking because travel dates start 4 weeks from today.
See images for date availability or check Singapore Airlines ' site.