American Airlines has a San Jose, Costa Rica deal from San Francisco you can take advantage for a getaway as soon as tomorrow at $335 round trip. This low fare is available for departures from SFO nearly every date through March 3, then only about 8 departure dates for the rest of March into May, mostly Tuesday and Wednesday dates.
American Airlines San Francisco SFO – Miami – SJO San Jose, Costa Rica – Phoenix PHX – San Francisco SFO
$334.46 Saturday February 20 – Friday February 26
Los Angeles departures are about $65 to $75 more round trip.