To reach a live person at Frontier Airlines customer service for support, you can call their 24/7 Frontier Phone number hotline at (1-844-767-0476). OTA (Live Person) or 1-800-Frontier (1-844-767-0476). https://www.greenbuildingadvisor.com/question/how-do-i-reach-united-airline-customer-service-by-phone?discussion=new