Right now there’s great business and first class award availability on Star Alliance airline ANA from several US cities to Tokyo and back starting in August and running through the end of the current airline schedule (basically, October). That’s great for connecting onward to Asia.
Two passengers can fly from Houston, Chicago, Los Angeles, San Francisco, San Jose or Seattle using miles from United (or Chase), Avianca LifeMiles, or even better Virgin Atlantic (which partners with several credit card transferable points programs).