Update: this popular deal may have sold out. See more deals >

Virgin has announced another systemwide flight sale. The airline has cut prices over 40 domestic routes, flying in and out of the hub at SFO. Round-trip fares start at $138. These are the rules:

– You can fly March 14 through June 12, but the travel dates vary on some routes.

– Sale prices are one-way, good for travel in either direction.

– Round-trip purchase not required.

– Book flights up to 21 days in advance, depending on the route.

– Sale expires 11:59pm CST March 11.

Compare the cheapest San Francisco flights here.

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