Scott’s Cheap Flights has found round-trip fares as low as $325 from Austin to Bogota (BOG) on American, Delta, Copa, Avianca, Aeromexico and/or United. Some of these may involve 2 or 3 flights each way.
Check your date pair at Google Flights.
Category: Copa
San Francisco to Nicaragua for Only $267 Round-Trip on Copa Airlines
A good price, available multiple dates this and next month.
http://www.secretflying.com/2016/04/san-francisco-to-nicaragua-for-only-312-return/
Nicaragua has some very nice scenery.