Displaying its airfares to consumers who didn't in the past visit Southwest's website could also bring in new customers for the airline. Customers must still book flights directly through Southwest.

Southwest Airlines, which long advertised fares only on its own website, is now posting prices to Google Flights as well.

Southwest Airlines is ringing in the new year with one-way airfares as low as $49 on some routes. Deals are also available on cruise, rental car, hotel and vacation packages as part of the sale.

Southwest Airlines' fares have tumbled to below $100 round-trip, just in time for you to book travel to your holiday destinations.

Southwest offers four fare types with varying levels of flexibility and benefits. Here's what to know before booking a ticket.

Southwest Airlines flights are now bookable on Kayak as the carrier continues its business evolution. “This is a great development for travelers,” Kayak CEO Steve Hafner said in a statement.

Now, travelers finally have Southwest fares displayed amongst the other U.S. carriers, making flight shopping even easier.” Will other platforms add SWA to their available flights?