Verithiathe honest score on any app
Updated July 2026 · real, multi-region App Store reviews
Head-to-head

Fly Delta vs United Airlines

Fly Delta 4.8★ · Free to download 75
Winner Fly Delta
United Airlines 4.8★ · Free to download 68

Fly Delta has a slight edge over United Airlines due to its more consistent app performance and better overall user satisfaction, despite both apps facing similar issues with bugs and login problems.

Full reviews: Fly Delta · United Airlines

Both Fly Delta and United Airlines apps are free to download and offer essential travel features, but Fly Delta generally receives higher praise for its reliability and comprehensive functionality, while United Airlines struggles with persistent bugs and a less intuitive user experience. Users of both apps frequently report login issues and slow performance, but Delta's app is often cited as superior for managing flights and receiving timely updates.

Head to head

Features and Functionality edge: Fly DeltaR5R41R74R30
Fly Delta Fly Delta users appreciate its comprehensive features, including easy check-in, real-time updates, and airport maps, with some calling it the 'best airline app' R5R41R74. However, some users report issues with specific features like adding mobility scooters, downloading boarding passes to wallets, or managing business profiles R30.
United Airlines United Airlines users praise features like consistent flight info updates, gate-to-gate mapping, and the ability to pick up where they left off on reservations R74. However, users also report difficulty with bag tracking, passport photo scanning, and the inability to add frequent flyer numbers .
Ease of Use edge: Fly DeltaR32R35R50R58
Fly Delta Many Fly Delta users find the app easy and intuitive to use for check-in and managing trips R32R35R50R58. Conversely, some users complain about being logged out frequently, slow performance, and difficulties with password resets and account creation R4.
United Airlines United Airlines users describe the app as easy to use and navigate for check-in and managing flights R77. However, a significant number of users find it complicated, not user-friendly, and report issues with typing in fields, navigating menus, and a confusing check-in process .
Reliability and Performance tieR41R56R4R37
Fly Delta Fly Delta is often praised for being reliable and providing good updates R41R56. However, a common complaint is the app being slow, laggy, or freezing R4R37R57R59. Many users also report persistent login issues and bugs after updates R3R7.
United Airlines United Airlines users appreciate the app's consistent updates on flight info and overall reliability R74. Yet, numerous reviews highlight significant reliability problems, including the app being slow, constantly crashing, not refreshing views, and displaying error messages .
Price/Value edge: Fly DeltaR1R51R76R82
Fly Delta Fly Delta is free to download, and while the app itself doesn't have direct costs, some users express frustration with flight price discrepancies between the app and other booking methods, or unexpected charges R1R51.
United Airlines United Airlines is free to download, but many users are highly critical of the airline's pricing structure, citing expensive tickets and numerous extra fees for seats, carry-on bags, and checked bags, which they feel are outrageous compared to other airlines R76R82.
Customer Support tieR14R20R23R26
Fly Delta Some Fly Delta users praise the customer service received when contacting the airline R14R20R23R26. However, others report negative experiences, including being unable to get assistance for flight changes or issues, or being required to call for simple tasks R1.
United Airlines United Airlines receives some positive remarks for friendly and professional customer service . However, many users report difficulty getting help from agents at the airport or over the phone, especially when the app fails to process changes or provide vouchers for delays .
Pick Fly Delta if

You fly Delta regularly and value a generally reliable app for check-ins, flight updates, and airport navigation, despite occasional login or performance glitches R5R41R56.

Pick United Airlines if

You are a frequent United flyer and appreciate features like gate-to-gate mapping and flight entertainment, and are willing to tolerate occasional app slowness or bugs R74.

Evidence note: Both apps are free, so there is no free-vs-paid asymmetry. The reviews for both apps show a similar pattern of recent negative feedback regarding bugs and performance issues, contrasting with higher lifetime ratings. This indicates a recent decline in app quality for both, making a direct comparison of current user experience still valid.

Frequently asked

Do these apps have issues with logging in?
Yes, both Fly Delta and United Airlines apps have frequent login issues, with users reporting problems after updates, incorrect password messages even with correct credentials, and difficulties with password resets (R3, R7, R34, R46, for Delta; , , for United).
Are the apps slow or buggy?
Yes, both apps are frequently described as slow, laggy, or buggy by users, with Fly Delta users mentioning slowness and freezing R4R37R57R59 and United Airlines users reporting constant buffering, crashing, and unreliability .
Can I check in and get boarding passes easily with these apps?
While many users report easy and swift check-in processes for both apps (R35, R50, R58 for Delta; R77, for United), others experience significant problems, including the inability to check in online, download boarding passes to a wallet, or find boarding passes easily (, , R59 for Delta; , , for United).

What reviewers actually said

Built only from these 120 real reviews (foreign ones translated). Superscripts jump to the quote here. Apple has no per-review links, so [ref] opens that app's reviews on the App Store.

  1. [R5] Fly Delta 5/5 · US Best airline app in the US: I fly constAntly and have top level status on all major IS carriers. Delta’s app is superior and beyond comparison. You literally never have to call the 1-800 number unless there are very unusual circumstances. As with all things regarding Delta, it’s the best in the industry and the best in the country and they continued to improve every day. I love this airline, I lov
  2. [R41] Fly Delta 5/5 · GB Best airline app: I rarely rate apps, but this one was amazing! Flew delta for a business trip and had a multi city journey - easy checkin, very good updates about gate changes and boarding time, very reliable which is important! + very good airport maps to help with navigation. By far the best across airlines I have used in US and Europe. If you could also add avg wait time for security (clear, g
  3. [R74] United Airlines 5/5 · US United Airlines App a Must Have: I am so impressed with the United Airlines App. Consistent Updates on Flight Info, Gate to Gate Mapping and Walking Distance Info. Seat Change optional literally up to the main door closing. Flight Entertainment at your Fingertips. A Really Awesome Travel Tool to Have
  4. [R30] Fly Delta 3/5 · GB Mobility scooter?: The website recommends using the app to add a mobility scooter to our trip. But when you go the flight and ask for special assistance it only refers to assistance within an airport. It is important this is added to the app, or, the website deals with it and does not recommend the app.
  5. [R32] Fly Delta 5/5 · GB App easy to use: Easy to use and update
  6. [R35] Fly Delta 5/5 · GB Check in: Super easy and swift check in.
  7. [R50] Fly Delta 5/5 · GB Ease of online check in: Simple and easy to use nothing too complicated at all Well done Delta. You certainly are one of our favourite airlines to fly with.
  8. [R58] Fly Delta 5/5 · GB Great experience: Easiest check in via app ever! Smoothly done
  9. [R56] Fly Delta 5/5 · GB Better than average: I use many airline apps. This is as good as it gets.
  10. [R4] Fly Delta 1/5 · US So slow: So slow
  11. [R37] Fly Delta 1/5 · US Great until checkout: It’s so damn slow and laggy…
  12. [R1] Fly Delta 1/5 · US Not helpful for international travel: I decided to change my flight to be one day earlier. On the app it said it would be 107 dollars more. Knowing that was cheaper than a hotel for another night, I attempted to book it. After hours on the phone I was then told it was 1000 dollars then 800 and finally 300. I ended up paying 300 despite the app saying 107. Do not let the app get your hopes up.
  13. [R51] Fly Delta 2/5 · US Another tool used for price inflation: The more the app was used the more they would inflate prices for the same flights I could purchase through Google or other third-party vendors
  14. [R76] United Airlines 1/5 · US Overpriced: Since regulators and unions killed Spirit, the tickets on United became twice as expensive Shame on you
  15. [R82] United Airlines 1/5 · US Carry-on: For as expensive as United flights are, not being allowed a carry-on is insane
  16. [R14] Fly Delta 5/5 · US Great service: I needed to correct a misspelled name. After contacting customer service, they responded promptly, were patient, and resolved the issue accurately. · translated
  17. [R20] Fly Delta 5/5 · GB Good airline: really good service great customer service and friendly manner - good price too. Thank you
  18. [R23] Fly Delta 5/5 · GB Malik Reza Chowdhury: Excellent service
  19. [R26] Fly Delta 5/5 · GB Crew & Pilot: We attended the funeral of our late uncle who was a loving, caring and considerate man. The crew on board and ground and air were very attentive without even knowing our circumstances and with their natural ability supported us through our flight. Not knowing what we were going through. Thank you Delta Crew and staff.
  20. [R3] Fly Delta 3/5 · US Unable to login using Delta app: After the most recent app update I am not able to login to my account using the app. Receive message to confirm login details and try again. That is unsuccessful. Account and password information is correct. Able to login to Delta website from my both my phone and computer with the same information. Hope app is fixed before my next Delta flight! It was a good app w
  21. [R7] Fly Delta 2/5 · US What’s with this app?: What’s with this app? How come I have to delete the app then reinstall it in order to sign in each time? Why does the app not keep my login information? Can this be fixed? I was very frustrated at the airport when I couldn’t open the app.
  22. [R34] Fly Delta 2/5 · US Logging issue: The app does not recognize my credentials. I am able to login through my computer but the app doesn’t wanna budge and keeps saying user not found. Please advise
  23. [R46] Fly Delta 2/5 · US Horrible: The app was working now I keep getting an error message unable to log in try later. I’ve been on a chat for 45 mins; removing the cache, uninstalling, reinstalling and still can not log in. I can access my account from my computer but not the mobile app.
  24. [R57] Fly Delta 2/5 · US Slow: Slow. Jesus Christ this app is s l o w. Don’t open this app when you’re in line for security or boarding. Have your boarding pass pre-loaded. You will hold up the line if you don’t.
  25. [R59] Fly Delta 1/5 · US Glitches and Freezes: The app is horrible. You can’t get a boarding pass to load. It just freezes with a blank screen.
  26. [R77] United Airlines 5/5 · US The best self check in: United provides a super easy self check in, flight change or cancellation and any other service you may need. Love this Airline and their App!

Synthesized from 120 recent App Store reviews · updated July 2026 · View on the App Store