Alaska Airlines, American, and Virgin are going neck and neck on this one. All of these carriers say that they offer roundtrip flights between Seattle and San Francisco for $119, but you need to book your flight a couple of weeks in advance, and weekend flights can cost $159.
Virgin America is offering direct roundtrip flights to Seattle from San Francisco for $139 this July. Its always cheapest to fly on Virgin on Tuesdays, Wednesdays, and Saturdays, but I’d suggesting searching on a number of different dates as well.
Flights to Seattle just seem to keep on getting lower. A number of airlines are now offering direct flights between Seattle and San Francisco for $119 roundtrip.
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San Francisco Deals