Exhibit 99.1 Operating expenses were $876 million in Q3 2025, up$95 million, or 12%, from $781 million in Q3 2024, driven by the increase in block hour production year-over- year, partially offset by operating efficiencies from higher utilization of our fleet. NEWS RELEASE CONTACT: Investor Relations Corporate Communications 435.634.3200 435.634.3553 Investor.relations@skywest.com corporate.communications@skywest.com SkyWest, Inc. Announces Third Quarter 2025 Profit Third Quarter 2025 Summary ST. GEORGE, U ...