Southwest Airlines does not provide a public "seat map" or a specific "load factor" number before you board, largely because they use open seating. However, there are a few "pro-tips" to gauge the capacity. During the booking process, if you try to book a group of 8 passengers and the site says "only 3 seats left at this price," it gives you a hint about the remaining inventory. After checking in, your boarding position is the best indicator: if you are in the C-group, the flight is likely near capacity (over 120 passengers). You can also use third-party tools like FlightAware to see if the flight has been consistently full on previous days. For a more direct check, you can ask a gate agent at the airport "if the flight is fully booked today"; they are usually happy to give you a general idea so you can prepare for the boarding process.