The question what terminal is Frontier Airlines at DFW refers to the terminal where Frontier Airlines operates at Dallas/Fort Worth International Airport (DFW). The answer is that Frontier Airlines primarily operates out of Terminal E at DFW. If you're asking what terminal is Frontier Airlines at DFW, Terminal E is where you'll find check-in counters, gates, and other services for your flight. This terminal is equipped with a variety of amenities to ensure a comfortable and smooth travel experience for Frontier Airlines passengers.