Originally Posted by
twtrvl
It will be from HNL. I haven't booked yet, but I plan to fly from HNL to SAN, PDX, or SEA via SFO, as the plane type options are preferable through SFO.
Generally speaking you should not need to re-clear security.
There is a possibility that your flight from SFO to one of those cities, if it is on United Express, may depart from Terminal 1. To get to Terminal 1 from Terminal 3, where you are most likely to arrive from HNL, you can take a special shuttle bus that keeps you behind security.
You can also exit security, take the airport train, and re-clear security -- but you won't be required to do this.