American Airlines has San Francisco SFO to San Juan SJU Puerto Rico at $350 for nearly every date from November 2015 to September 2016, with the exception of the last two weeks in December. This is a great fare for travel via Miami or New York JFK.
American Airlines San Francisco SFO – Charlotte CLT – San Juan SJU – New York JFK – San Francisco SFO
$351.10 Tuesday February 16 – Tuesday February 23
Flight Miles: 7,954 miles. Earn 8,367 flight miles if you can route via JFK both ways.