Southwest seats are slightly wider, averaging 17-17.8 inches, compared to Delta’s standard economy seats at 17-18 inches. Delta’s Comfort Plus offers similar width but adds 34 inches of legroom, surpassing Southwest’s standard 31-33 inches. Southwest’s open seating contrasts with Delta’s assigned seats. For specific aircraft details or to compare cabin classes, check Delta or Southwest’s websites. If you need help choosing the best option for your trip, contact Delta’s support team at 877-297-0699 for guidance.