4.72★ from 1,279,979 ratings · version 3.7.4 · 42 of the last 63 written reviews are one or two stars
Check-in process fails with errors and timeouts
7of the 42 read·17%
Users report the check-in feature repeatedly crashes, times out, freezes, or returns errors, making it impossible to check in before flights.
›read 3 of these reviews
“Check-In Process — The check in process is so slow. I have to click a button and insane amount of times to continue and then the app says that the request has times out or to please try again later. Useless app.” — ★☆☆☆☆ · English“DONT USE THE App — I’ve been trying to check in for 30 minutes now with no luck the information is correct but it’s glitched this is the last time I use frontier” — ★☆☆☆☆ · English“App is terrible — I tried to check in on the app the day before my flight but it kept telling me there was an error. I closed and reopened it a couple of times until it finally worked and I received my boarding pass. When I got to the airport my boarding pass was gone and I had to check in again. When Ingot past security, I waited at my gate. When it was time to board the plane, my boarding pass disappeared again. I…” — ★☆☆☆☆ · English
App crashes, glitches, and fails to load
4of the 42 read·10%
The app frequently crashes, glitches, and fails to load basic features or complete tasks, requiring constant reopening and updates.
›read 3 of these reviews
“Fly Delta — This app is just as bad as the airline themselves. Glitchy, app updates don’t happen until hours after the flight lands and things fail to load.” — ★☆☆☆☆ · English“Shoddy Broken App — This is a shoddy and broken app foisted onto us by a shoddy and broken airline. It does not work, it will not check you in for your flight and no one at this company will help you in any way, they have a policy that you can’t check in less than an hour before the flight but they likely won’t even have anyone working at your gate until that time. They’ll be real helpful taking your money for…” — ★☆☆☆☆ · English“Frontier — The app used to be really great but for the last few months it’s been annoying. Almost every 2 weeks you have to update it and in the app it doesn’t tell you if your gate has changed or not, so recently I almost missed a flight because it didn’t tell me my gate change and I only seen the new gate because I looked at the screen in the airport. I love frontier but they need to do better with the app.” — ★★☆☆☆ · English
Cannot update or sync personal account information
3of the 42 read·7%
Users cannot edit personal details, update information, or sync data between the app and website, or the app won't save changes.
›read 3 of these reviews
“Cannot edit personal account info details — You cannot update your personal info bc it asks for a date of birth to be input but it does not let you input one. Your entire website in the browser doesn't let you login to your account either” — ★★☆☆☆ · English“Terrible service — Terrible airline you can’t even edit your information to buy a flight for someone else” — ★☆☆☆☆ · English“Doesn’t save information — All of my profile information exists on the website. But you can’t check in on the website. But the app doesn’t show any of my profile information — even though I’m logged into the same account. And it won’t save any of the information if I try to edit it. So when I check in, I can’t get TSA pre-check because it won’t save my KTN number. The app is terrible.” — ★☆☆☆☆ · English
Cannot sign up, log in, or access accounts
3of the 42 read·7%
Users cannot create accounts, sign up, reset passwords, or link previously booked trips to their accounts.
›read 3 of these reviews
“wth — i cant sign up” — ★☆☆☆☆ · English“Reset password — Very bad , I can’t reset my password, it’s literally impossible, I hate it” — ★☆☆☆☆ · English“WTF — I’m never able to link my trips booked outside of the app to my account. I have tried SOOOO MANY TIMES and it NEVER WORKS! What’s the point of the app if it can’t complete the simplest of tasks?” — ★☆☆☆☆ · English
Apple publishes the most recent written reviews, up to five hundred, and that is what was read — not a search for bad ones. Why so many of them are angry. The complaints above come from the 42 most recent negative ones. Newest review 2 days ago (07.09.2026), last collected today.