Flash Sale: Southwest Is Selling Cheap Flights Starting at $42

Flash Sale: Southwest Is Selling Cheap Flights Starting at $42 © Wilfredo Lee/AP Photos A Southwest Airlines boeing 737 takes off from Palm Beach International Airport in West Palm Beach, Fla. on Feb. 10, 2017. The deadline for taking advantage of a huge sale from Southwest Airlines is rapidly approaching.

The airline is offering discounted prices on hundreds routes, and tickets must be booked by Thursday, August 17. Many routes start under $50 each way, and at least one (Los Angeles to Las Vegas) costs just $42.

There are some great deals on international routes too, including cheap prices to Mexico and the Caribbean. For example, tickets are going for as little as $59 on flights from Fort Lauderdale to Grand Cayman.

A 21-day advance purchase is required, and there are some restrictions. For the most part, the lowest fares on domestic flights are not available for departure on Fridays and Sundays. Some blackout dates apply around holiday periods, and availability is limited.

Here is a sample of sale prices for flights nearly everywhere Southwest flies. All prices are listed on a one-way basis, before mandatory taxes and fees are added. Here’s where you can find the full list.

Washington, D.C. (Dulles to Reagan) to Fort Lauderdale: $69

*Note: Some flights from the Caribbean or Mexico back to the U.S. are significantly more expensive. For example, Southwest’s sale price from Belize City to Fort Lauderdale is $145, compared to $69 for Fort Lauderdale to Belize City.

This article was originally published on Money.com