At the United Airlines LAX terminal, you will find multiple check-in counters, self-service kiosks, and dedicated areas for priority travelers. To save time, it is best to check in online before arriving at the airport. Security checkpoints are well-staffed, though lines can get long during peak hours, so arriving early is always recommended. https://terminalsworld.com/airlines/southwest-airlines/southwest-airlines-san-francisco-international-airport-sfo-terminal/