According to Expedia, it will take some time for all of Southwest's flights to get loaded into the system, but the airline's full schedule should be bookable on Expedia platforms by the end of the day on Thursday. It's just one of many changes bringing Southwest in line with its competitors.

Greg Schulze, Expedia Group Chief Commercial Officer, said, "Southwest Airlines is a beloved brand known for its customer-first service and operational excellence. This partnership aligns perfectly with our mission to offer the most travel options and deliver exceptional value to our customers."