Depends on timing.. China seems seasonal.
I booked a flight yesterday for China for this Wednesday - that's 4 days notice..
tons of availability in March/April when i looked in economy and business.. and on AA and UA.

So if you have to go during a high season. no chance. (i.e. december was hard, i couldn't get a ticket a couple of years ago even several months out)..
but march/april no one goes there, so you should be good.

AA is not good for Seattle.. flying to ORD then connecting is going backwards.
UA is much better - connections through SFO, or partners that connect through NRT, ICN, or Taipei somewhere.