Although I mentioned briefly in this link that UA's ICN-PHL and ICN-PHX is 600 USD:
http://www.flyertalk.com/forum/milea...s-600-usd.html
now UA has $600 price to almost everywhere in the US, by taking advantage of 0-day stopover at either PHL or PHX. Tons of days are available in September or later, but I think it will work from right now as long as K class is available. The price itself requires no min stay and 12 months max stay.
For example, 10/7 ICN-PHX, 10/7 PHX-LAX, 10/14 LAX-ICN is $606 in orbitz.
10/7 ICN-ORD, 11/11 ORD-PHL, 11/12 PHL-ICN is the same price. It will be really useful for many of us.