Yes, Frontier Airlines sends a confirmation email after you book a flight. This email serves as a receipt and includes important information such as your booking reference or confirmation number, flight details (departure and arrival times, airport codes, and flight numbers), seat assignment if applicable, baggage allowance, and a link to manage your booking online. It's crucial to check your email and review the confirmation thoroughly to ensure all details are correct. If you haven't received a confirmation email after booking, check your spam or junk folder, or contact Frontier Airlines customer service for assistance.