Fly from San Francisco to Lihue, Kauai for $334 roundtrip on American Airlines.
Flights at this price can be found on select weekdays starting as soon as next week through mid-November. You'll have to be flexible with dates but availability is out there.
Searching on AA.com, I found seats departing SFO on Tuesday, August 28 and returning from LIH on Thursday, September 6, 2018. Other travel dates are scattered throughout the fall.
For those of you who call the Bay Area home, we've got a lot of great deals out of San Francisco (SFO), Oakland (OAK) and even San Jose (SJC) today, so make sure to click on through and have a look.
Need a place to rest your head in Hawaii? Here's what's available for the sample dates on Hotelwatchdog.