You'll need to hurry.

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This article originally appeared on Travel + Leisure 

For three days only, Southwest Airlines is selling one-way tickets for as little as $49. Sale fares booked by June 8 are valid for travel between August 22 and December 13

As USA Today pointed out, the $49 flights are largely valid on short, regional routes, like Washington, D.C. to Durham, North Carolina or Sacramento to Las Vegas. But for less than $100 round-trip, it might be worthwhile to plan a short, weekend-long trip in a neighboring state.

Southwest’s sale isn’t restricted to these ultra-cheap trips. Travelers can also find serious savings on more distant destinations and even a few international cities. Florida-based travelers, for example, can fly to Havana, Cuba for as little as $89 one-way, with the return leg costing $95 (a cool $184 round-trip, taxes included).

Flights originating in Boston include $59 one-way fares to Nashville and $58 flights to Atlanta, while flights departing from Los Angeles are on sale to Portland, Oregon; Tahoe, Nevada; and Denver, Colorado for $79 one-way.

Travelers should note that blackout dates apply, and seats are extremely limited. You’ll want to book well before the sale expires at 11:59 p.m., in the time zone of the originating city (that’s midnight PT for flights departing from California, for example, and midnight EST for flights departing from the New York area).

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Travel dates and day-of-travel restrictions can also vary wildly depending on the city, so expect availability to fluctuate depending on your destination.

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