Hey alliance, thanks for the help.

I've found a decent outbound flight as follow:

Dec 13/SQ602/SIN-ICN/ 2C + 1F
Dec 14/OZ202/ICN-LAX/ 3C
Dec 14/UA6522/LAX-PHX/1Y ; US359/LAX-PHX/2C

but i'm having trouble with my return flight on Dec 28.

On the ANA *A tool, i foudn that
DEC 28/OZ 201/LAX-ICN was available but when i called united, it was unavailable.

i think
DEC 30/SQ 603/ICN-SIN/ 2C + 1F is available according to the tool (but yet to verify over the phone with united).

any other tips?

thanks everyone!