This week's Southwest Airlines sale is valid for travel through May. Although these prices have been available for spring travel over the past few weeks, this is the first time this season that we've seen Southwest advertise its sale for spring travel. Book soon to make sure you get the flights you want. Fares start at $98 roundtrip.

As always, pack all you want because Southwest still allows two free checked bags, while the other airlines have upped bag fees to $30 each way. If you're indecisive, there's less to worry about with Southwest's no change fee policy. Learn more about Southwest's perks in our guide on How to Fly Southwest Airlines (And Get the Seat You Want).

On most domestic routes, sale fares are available for travel on Mondays, Tuesdays, Wednesdays, Thursdays, and Saturdays, through May 22, 2019, with a 14-day advanced purchase required. Travel to Florida and Nevada is valid Sundays through Wednesdays, while travel from Florida and Nevada is valid Tuesdays through Fridays.

As expected, peak holiday flights are blacked out on November 20-21, November 24-26, December 21-23, December 26-27, December 29-30, 2018; January 1-2, 2019. International travel is valid on varied days of the week through December 6, 2018, and January 8 - March 6, 2019, with a 21-day advanced purchase required.

All tickets must be booked by Thursday, November 1, 2018, at 11:59 pm.

Please note, these fares are only available on Southwest.com. Other carriers regularly match these sale fares, so be sure to compare to find the best deal.

Sample nonstop sale fares include:

Salt Lake City to Las Vegas $98 roundtrip

San Jose to Las Vegas $98 roundtrip

San Francisco to Las Vegas $98 roundtrip

Fort Lauderdale to Orlando $116 roundtrip

San Diego to Sacramento $118 roundtrip

Atlanta to Nashville $130 roundtrip

Phoenix to El Paso $138 roundtrip

Atlanta to Columbus $138 roundtrip

Columbus to Washington D.C. $156 roundtrip

Little Rock to St. Louis $158 roundtrip

Los Angeles to Tucson $166 roundtrip

Cleveland to Nashville $190 roundtrip

Baltimore to Pittsburgh $210 roundtrip

Chicago-Midway to Orlando $212 roundtrip

Charleston to Houston $224 roundtrip

Birmingham to Dallas $238 roundtrip

Atlanta to Las Vegas $278 roundtrip

St. Louis to Los Angeles $310 roundtrip

Indianapolis to Phoenix $326 roundtrip

Phoenix to Philadelphia $358 roundtrip

All fares will work in the reverse direction and there are many more routes available as well. Lower fares may be available on some routes that compete with ultra-low-cost carriers.

As an example booking, I found seats departing Salt Lake City SLC on Monday, November 19, returning from Las Vegas LAS on Friday, November 23, for $98 roundtrip. Perfect for an off-peak Thanksgiving Getaway!