Frontier Airlines operates exclusively out of Terminal 5 at Chicago O'Hare International Airport (ORD). Terminal 5 is the main international terminal but also handles some domestic flights, including those operated by Frontier. This terminal has all the necessary facilities such as check-in counters, security checkpoints, baggage claim areas, and Customs and Border Protection for international travelers. Terminal 5 is connected to the other terminals by shuttle services and the Airport Transit System. So whether arriving or departing with Frontier at ORD, you will be using Terminal 5.
