It's not too early to make your winter holiday travel plans.

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Summer isn't over, but it's not too early to start thinking about booking fall and winter travel, especially if you plan to fly during the busy Thanksgiving and holiday season.

To get a jumpstart on holiday booking, Southwest is having a flash sale with domestic flights starting at $47 one-way.

Deals include flights from New York City to Atlanta for $95 or to Chicago for $88, from Atlanta to Nashville for $65 or to Denver for $120, or from Las Vegas to Long Beach for $47. Check for flight deals from your home airport to see everything that's available.

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International flights are on sale starting at $59, and destinations include Grand Cayman, Cancun, Cabo, San Juan, Belize city, Montego Bay, Nassau, among others.

The cheapest flights are out of Fort Lauderdale, where you can fly to Grand Cayman for $59 one-way, to Belize City for $69 one-way, to Nassau and Providenciales for $74 one-way, to Cancun for $95 one-way, to San Juan for $98 one-way, to Montego Bay for $117 one-way, and to Punta Cana for $157 one-way. To see what deals are available from your airport, check on Southwest's site.

Southwest's flash sale is available for domestic travel from August 21 through Feb. 13, 2019, and for international travel from August 21 to December 12. Book by July 26.