Planning to fly with Allegiant? The Allegiant Air Belleville Office offers full customer support to ensure your trip starts on the right foot. Located near MidAmerica St. Louis Airport, the office provides flight booking, itinerary assistance, cancellation support, and real-time travel updates. Allegiant Air offers non-stop, budget-friendly flights to vacation destinations across the U.S., and the Belleville office helps make the process easy and convenient. Friendly staff members are available to answer your questions and assist with special travel needs. For affordable flights and professional service close to home, visit or contact the Allegiant Air Belleville Office today.