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If you're wondering, "What Terminal is Frontier Airlines at ORD?" Frontier Airlines operates out of Terminal 5 at Chicago O'Hare International Airport. This terminal caters to international and low-cost carriers, providing efficient check-in counters, quick security processing, and a range of amenities like dining options and shops. Whether you're traveling Domestically or Internationally, Terminal 5 ensures a streamlined and convenient experience for passengers flying with Frontier Airlines at ORD.