Frontier Airlines is an American low-cost carrier that operates flights within the United States and to and from international destinations. If your plans change, we won't penalize you. Frontier Airlines Cancellation Policy is designed to be flexible and customer-friendly. You can cancel your flight without paying a fee if you do so within 24 hours of booking. This policy gives you the peace of mind and flexibility you need when making travel plans. If you need more information, Call Us at +1-888-982-1907