I was looking for flights for my family and every ticket that i found was at
least $1300. i ended up finding a deal for ~$700 on Vayama.com
The routing is Denver - LA - Tokyo (Haneda) - Osaka.
October 12th - 27th
All other flights are listed as about 50:50 flight and tax while this one
has a very low tax. i'm not sure why but it's almost 50% of the "regular"
price.
Link: http://www.vayama.com/results/index.jsp?s=473836504&tab=1&start
For whatever reason the same LAX - Tokyo flight RT is $1300 alone when the
same dates are used.