Logan Airport

Southwest is offering one-way flights from Boston for as little as $49, but you have to act fast

The 72-hour flash sale ends Oct. 3.

Southwest Airlines planes. Mike Stewart / AP, File

Boston travelers can save money on airfare to warm-weather cities like Nashville and Tampa this winter by booking with Southwest Airlines during the carrier’s 72-hour flash sale.

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Southwest is currently offering flights — some of them nonstop — out of Logan International Airport for as low as $49 one-way for travel between Nov. 13 and Feb. 12. For example, Logan travelers can fly from Boston to Baltimore for $49, Chicago and Nashville for $79, and Tampa for $130.

Travelers should note the terms and conditions of the sale, which include blackout dates from Nov. 22 to Dec. 3 and Dec. 19 to Jan. 5. Also, travel is limited in some instances to certain days of the week.

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You can check out all of the deals on Southwest’s sale page by plugging in your departure city.

The trip must be booked by 11:59 p.m. PT on Oct. 3.