Southwest Airlines is the US’ fourth-largest airline by available flights. In the first half of 2026, Cirium Diio data shows that it has about 3,900 daily flights. Its offering is flat year-over-year.
Southwest Airlines is the US’ fourth-largest airline by available flights. In the first half of 2026, Cirium Diio data shows that it has about 3,900 daily flights. Its offering is flat year-over-year.