This fare prices out at 110,000 United MileagePlus miles for a one-way business class ticket from LAX to Tokyo Narita. The typical going rate for this route and cabin through United's program runs around 140,000 miles, so you're looking at a savings of approximately 30,000 miles.
The catch: there's only one seat available at this price. That makes this a solo traveler opportunity rather than a family booking, but it's worth flagging for anyone with flexible plans or a partner traveling separately.
Taxes and fees are negligible at just $6, which is about as low as you'll see for transpacific award flights. United's Polaris business class offers lie-flat seats on this route, making the overnight journey considerably more comfortable.
If you're considering this, don't wait. Single-seat availability like this tends to disappear quickly, and June is prime travel season for Japan when availability becomes increasingly scarce.
How to book
Search and book directly through United's award search tool: https://www.united.com/en/us/book-flight/united-awards/search