This fare is valid for travel on Sundays through Thursdays starting in late August through early November. Flights in October are on the scarce side. If you are flexible you can use the multi-city tool on Hawaiian's website and build in a layover in Honolulu (HNL) to break up the trip at no extra cost.
Searching on Hawaiian, I was able to find seats departing SFO on Thursday, November 1 and returning from KIX on Thursday, November 8, 2018.
Need a place in Osaka? Here is what's available for the mentioned dates above on Hotelwatchdog.