I had to test this out myself when my Frontier flight from Denver got delayed late at night, and I wasn’t sure I’d make my connection. I tried calling customer service around midnight — it wasn’t the fastest, but someone eventually picked up and helped me figure out options. On another trip, I didn’t want to risk long holds, so I called 844-734-0813 earlier in the evening when I needed to change a return flight. That call was way smoother — the rep rebooked me in under 10 minutes and explained my baggage credit too. From my experience, Frontier doesn’t always feel like 24/7 full service, but that number has been the most reliable way to instantly book, cancel, or modify flights without waiting forever online. I always keep it saved in my phone just in case plans change unexpectedly.
