Now, you can count booking giant Expedia among those sites. And, you'll also start seeing Southwest flights listed on additional Expedia Group third-party booking sites like Travelocity, Hotwire, Orbitz and CheapTickets, the carrier said Wednesday.

The BriefSouthwest Airlines customers can now book their flights on Expedia.Prior to today, Southwest only allowed customers to book flights through its own platforms.This third-party partnership comes as the Dallas-based carrier is expanding its route map with new international and domestic flights.

The move marks another major shift for Southwest, which had resisted online travel agencies and meta search platforms for decades.