Southwest Airlines is the dominant carrier at Orlando International Airport (MCO) in 2026, holding a massive 25% market share. With over 94,000 annual flights and an average of 260 daily departures, Southwest serves more destinations from Orlando than its next two closest competitors combined. This includes nonstop service to over 60 cities across the United States, as well as several international routes to the Caribbean and Central America. Following Southwest, the largest carriers by volume are Spirit Airlines (14%) and Delta Air Lines (12%). For travelers, this means Southwest offers the most flexibility for domestic connections and remains the go-to for many visitors due to its "two free bags" policy and extensive schedule. Whether you are flying to Baltimore, Dallas, or Nashville, the sea of blue and yellow planes at MCO is a testament to Southwest's commitment to being the primary gateway for the world's theme park capital.