Frontier Airlines terminal at Chicago O’Hare Airport is located at O'Hare International Airport, one of the busiest airports in the United States. Frontier Airlines primarily operates from Terminal 5, which handles many international and select domestic flights. Passengers can find check-in counters, security checkpoints, dining options, and other essential services within the terminal. It is recommended to arrive early to allow enough time for check-in and security procedures. Checking flight details in advance can help ensure a smooth and hassle-free departure experience from Chicago O’Hare Airport.