- Frontier Airlines O’Hare Airport operates from Terminal 5 at O’Hare International Airport (ORD) in Chicago, Illinois, offering budget-friendly domestic and select international flights. As an ultra-low-cost carrier, Frontier allows passengers to customize their travel experience with optional add-ons. Travelers should check in online or at airport kiosks and arrive early for baggage drop and TSA screening. Terminal 5 provides dining, shopping, and lounge options, though Frontier does not have its own lounge. Ground transportation includes taxis, ride-shares, rental cars, and the CTA Blue Line for easy city access. Arriving 2-3 hours before departure ensures a smooth journey through O’Hare.