$120 - Round Trip Flights to San Diego on Virgin America

Virgin America is currently offering one-way flights to and from San Diego for $59. They have flights between San Francisco and San Diego four times per day, almost every day of the week.

Note, you may need to book a couple weeks in advance if you want this price for any of their flights, but you can often get last minute flights for this price if your flight times are flexible.

Flight Booking Details: Book through the Virgin America website.