Cheap Flights from Boston to San Francisco

JetBlue and Virgin are two of the best airlines to fly around the US right now. JetBlue is now offering the cheapest flights to San Francisco from Boston for $219 including all taxes and fees.

Just announced as part of their summer sale, Virgin America is offering one-way flights between San Francisco and Boston for $109.
Flight Details:
May need to be flexible enough to avoid booking on certain days. May need to book two weeks in advance.