https://www.tadalive.com/blog/285966/when-can-i-pick-my-seat-on-southwest-airlines/ tadalive.com

Southwest Airlines provides different platforms for selecting a seat inside the flight, which can be done through the web, app, or airport. The process is straightforward and accessible with just a few clicks. You can select the seat at the time of reservation, but extra fees will be charged if you want to pick a seat that fits your comfort. So here's how you can choose a seat during online check-in.