Fly from San Francisco to Antigua and Barbuda for $385 round-trip on American Airlines, late summer and fall travel available.
Departures are only available on Tuesdays for this price, but returns are available during the week Monday through Friday.
Searching on AA.com, I was able to find seats departing SFO on Tuesday, September 11, and returning from ANU on Thursday, September 20, 2018.
On our San Francisco SFO flight deals page we have a running list of all the super fares we've found departing SFO, so make sure to have a look.
If you need a beach view room, we've got you covered with this list of seaside accommodations from Hotelwatchdog.