The Southwest Airlines Boeing 737-800 is configured in a single-class layout with a total of 175 seats. This aircraft is slightly larger than the more common 737-700 in the fleet and features the modern "Heart" interior, which includes a blue-and-red color scheme and slimline seats designed to maximize space. All 175 seats are Economy Class, as Southwest does not offer a traditional Business or First Class cabin. The seats are arranged in a 3-3 configuration throughout the aircraft. The standard seat pitch (the distance between rows) on this model is approximately 32 inches, and the seat width is about 17.8 inches. Despite the high seat count, the cabin feels relatively spacious due to the Boeing Sky Interior, which features sculpted sidewalls and LED lighting that changes color based on the phase of the flight. This specific seat density allows Southwest to maintain its low-cost model while providing a consistent experience for all passengers, regardless of where they sit on the plane, since the airline utilizes an open-seating policy.