It's not too late for a great vacation.

By Jess McHugh
August 16, 2017
Getty Images/iStockphoto

Southwest Airlines is having a huge sale, with flights as low as $42 one way.

The airline is offering hundreds of routes, but travelers will need to act fast and book by Thursday at midnight.

Routes include popular international destinations such as Aruba, Mexico, Belize, and the Caribbean. Travelers from Baltimore, Austin, and Atlanta can fly to Cancun, Mexico for less than $200 one-way.

Related: Those Cheap Flights to Hawaii Are Finally Here

The deals feature a number of short-hop flights for $49, including between Chicago and Cincinnati or Baltimore and Providence.

On the West Coast, travelers in Los Angeles can fly to Las Vegas for $42. Flights from Austin to L.A. are $107.

Other highlights include flying from Boston to Dallas for $78 and Washington, D.C. to Fort Lauderdale, Florida, for $69.

All travel must be booked 21 days in advance, and certain blackout dates apply, particularly around holidays.