How To Book a Frontier Airlines Flight Booking a flight with Frontier Airlines is simple. Start by visiting Frontier's official website. Enter your departure and destination cities, travel dates, and the number of passengers. Click "Search" to view available flights. Select your preferred flight and fare option, then proceed to add any extras such as baggage, seat selection, or travel insurance. After reviewing your choices, click "Continue" to enter passenger information. Complete the booking by providing payment details and confirming your reservation. You'll receive a confirmation email with your itinerary and booking details. For additional assistance, you can contact Frontier's customer service.