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SCORE ONE-WAY FLIGHTS FROM $49: Southwest's Spring Sale features select one-way flights starting at just $49,Watch Project Power Online with travel valid from late March to early June. You'll want to book ASAP, though, as your last chance to score these flight deals is March 6 at 11:59 p.m. PT.

Opens in a new window Credit: Southwest Southwest Spring Sale Book flights for as low as $49

Just last week, Southwest Airlines ran a sale that dropped flight prices by up to 30%. If you missed out, don't fret. Another flight sale has arrived just a week later.

The Southwest Spring Sale runs through March 6 and features flights from as low as $49 one-way, with travel dates from late March to early June. Continental U.S. travel is valid between March 24 and June 11, while international travel (as well as Puerto Rico and continental U.S. to and from Hawaii) is valid between April 20 and May 21. As with any major travel sale, there is some fine print: Blackout dates may apply around Easter and Memorial Day, and the sale requires a 21-day advance purchase. Otherwise, with a little flexibility, you can book that much-needed vacation or weekender without spending a fortune.

SEE ALSO: The JetBlue Big Spring Sale has sale flights for just $49 each way

Certain seats and markets are limited, and this rate may apply to nonstop or connecting flights. For instance, I can fly from Nashville to Chicago or Atlanta for $49 or New York, Washington, DC, or Sarasota for $89. Check out the Southwest low fare calendar for an idea of what flights are available in your region.

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One of our favorite sites for cheap flights, Southwest regularly holds sales with ultra-low fares. As long as you're willing to adapt your parameters to fit the Spring Sale mold, your next vacation could actually be affordable — something we don't take lightly in this economy.