Virgin America has a very low $74.60 one-way fare between LAX and New York LGA La Guardia Airport. The one way fare between San Francisco and LGA is as low as $87.60 or $93.20. There are very limited departure dates in late January and February for LAX route at $75. There are more departure dates for SFO for booking low round trip tickets at $175.20 or $186.40. These are all one-stop flights via Dallas DAL.
Virgin America New York LGA – Los Angeles LAX
$74.60 one-way Wednesday January 27
Virgin America New York LGA – San Francisco SFO
$175.20 round trip Tuesday January 26 – Tuesday February 2, 2016
There are limited dates for these low winter fares on Virgin America, but a great deal if you can work these flights into your travel plans.