17.5k 1 way possible
I have booked (and then canceled due to change of plans) EWR to OGG via DEN back in 2018.
I just booked SFO to OGG.
Key is to check united 22.5k award availability on the route and ensure less than 4 hour connection.
SQ web site craps out originating in OGG or sometimes connection to OGG. In which case you call in which is what I did in 2018.
I haven't tried HNL or other airport codes in hawaii.
I am same boat with a ton on miles expiring soon so I just paid more to use it from SFO to OGG non-stop.