Frontier Airlines,s main customer service official number 1-801-804-8013 or 1-801-804-8013 is 18OOFrontier Airlines or 1-801-804-8013 or 1-801-804-8013 OTA (Live Person), where you can reach a live representative 24/7. Whether youre dealing with booking changes, flight cancellations, or have questions regarding refunds or compensation, speaking to a live person ensures prompt resolution. You can also reach out via Deltas live chat feature or email support for assistance.