Flight number record
UA 555
United Airlines · Atlanta to Newark
- Route
- ATL → EWR
- Departs
- 16:35
- Flights
- 282
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 555, check with United Airlines.
UA 555 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 282 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.6%, so UA 555 runs 8 points behind the country as a whole. Across a thousand flights that is about 77 extra late arrivals.
Key figures
On time
69.9%
Arrivals under 15 minutes late, of 272 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
3.19%
National rate is 1.81%
1 hour+ late
14.7%
National rate is 8.1%
These figures cover 282 flights between July 2025 and June 2026. Beyond the headline rate, 14.7% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When UA 555 flies
UA 555 flies ATL to EWR without a single fixed slot. Its most common scheduled departure was 16:35, used on 35 of 282 flights, with 16:29 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 16:3535 flights12.4%
- Departs 16:2932 flights11.3%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 16:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 555 runs 3 points worse at 69.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 555 next to ATL to EWR
Every carrier on ATL to EWR combined arrived on time 72.8% of the time across 6,285 flights, so UA 555 is 3 points behind it. United flew 1,963 flights on the same city pair under all its flight numbers, including this one, and those ran 79.5% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 555thin sample | 282 | 69.9% | 89 min | 3.19% | C− |
| All United Airlines on ATL–EWR | 1,963 | 79.5% | 83 min | 3.06% | B− |
| All carriers on ATL–EWR | 6,285 | 72.8% | 74 min | 3.34% | C− |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 555 quarter by quarter
UA 555 did not run the same all year. Its best quarter was Jan–Mar 2026 at 81.9% on time and its weakest Oct–Dec 2025 at 58.4%, a swing of 24 points on roughly 71 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202552 flights71.2%
- Oct–Dec 202580 flights58.4%
- Jan–Mar 202677 flights81.9%
- Apr–Jun 202673 flights69.0%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, UA 555 did best on Wednesday at 76.1% on time and worst on Sunday at 61.9%. Each day rests on about 40 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 555 runs late
One category carries most of the weight here. National Airspace System accounts for 66% of the 7,323 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 66%National Airspace System
- 24%Late-arriving aircraft
- 9%Carrier
- 1%Extreme weather
66% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 4,839 minutes out of 7,323, against a national NAS share of 21%. The split is drawn from 7,323 delay minutes reported on UA 555.
Cancellations run at 3.19%, against 1.81% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 14.7% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 746 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on fourteen other city pairs in the data, including EWR to PHX (56), EWR to PWM (36) and EWR to SFO (30), but none flew often enough under UA 555 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to EWR only.
One caution: this is a thin sample. 282 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking UA 555
For a booking, the cancellation rate is the figure to plan around on UA 555: 3.19% of its 282 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to EWR, every carrier and departure
- EWR to ATL, the return direction
- Delta Air Lines 2322 on the same route74.4%
- Frontier Airlines 4602 on the same route56.0%
- Delta Air Lines 2312 on the same route69.9%
- Delta Air Lines 2397 on the same route86.1%
- Delta Air Lines 2498 on the same route56.2%
- Frontier Airlines 1158 on the same route69.4%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Newark Liberty International (EWR) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- How often a connection fails at the major US hubs
A flight number here means United Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.