Flight number record
UA 555
United Airlines · Atlanta to Newark
- Route
- ATL → EWR
- Departs
- 16:25
- Flights
- 309
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 555, check with United Airlines.
UA 555 draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 309 flights, with a median arrival right on schedule.
The national on-time rate over the same period is 77.3%, so UA 555 runs 10 points behind the country as a whole. Across a thousand flights that is about 102 extra late arrivals.
Key figures
On time
67.1%
Arrivals under 15 minutes late, of 292 completed flights
Avg delay
96 min
Across delayed arrivals only, not all flights
Cancelled
4.85%
National rate is 1.89%
1 hour+ late
16.4%
National rate is 8.3%
These figures cover 309 flights between September 2025 and August 2026. Beyond the headline rate, 16.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 555 flies
UA 555 flies ATL to EWR without a single fixed slot. Its most common scheduled departure was 16:25, used on 47 of 309 flights, with 16:35 (35 flights) next.
- Departs 16:2547 flights15.2%
- Departs 16:3535 flights11.3%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 16:25 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 555 runs 5 points worse at 67.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 555 next to ATL to EWR
Every carrier on ATL to EWR combined arrived on time 72.3% of the time across 6,246 flights, so UA 555 is 5 points behind it. United flew 2,024 flights on the same city pair under all its flight numbers, including this one, and those ran 79.0% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 555thin sample | 309 | 67.1% | 96 min | 4.85% | C− |
| All United Airlines on ATL–EWR | 2,024 | 79.0% | 90 min | 2.92% | B |
| All carriers on ATL–EWR | 6,246 | 72.3% | 78 min | 3.78% | C− |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | 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 Jul–Sep 2026 at 47.8%, a swing of 34 points on roughly 77 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 202526 flights—
- Oct–Dec 202580 flights58.4%
- Jan–Mar 202677 flights81.9%
- Apr–Jun 202673 flights69.0%
- Jul–Sep 202653 flights47.8%
Scale runs 40% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, UA 555 did best on Wednesday at 74.5% on time and worst on Sunday at 59.1%. Each day rests on about 44 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 555 runs when it is late
The 96 late arrivals split 20 under half an hour, 28 between 30 and 60 minutes, and 48 an hour or more.
- 15+ min early44 flights15.1%
- Within 15 min152 flights52.1%
- 15–29 min late20 flights6.8%
- 30–59 min late28 flights9.6%
- 1–2 hours late23 flights7.9%
- 2+ hours late25 flights8.6%
Scale runs 0% to 100%.
Share of 292 completed flights by arrival against schedule.
13 of 89 late departures made up the time and arrived on time, 15% of them. In the other direction, 20 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at EWR.
The worst days
Worst days for UA 555
The latest arrival of the period was on 14 June 2026, 8 hours 13 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. Three of the five worst days fell in June 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 June 2026 | 8 hours 13 minutes | National Airspace System |
| 9 July 2026 | 8 hours 3 minutes | Late-arriving aircraft |
| 20 August 2026 | 6 hours 43 minutes | National Airspace System |
| 12 June 2026 | 5 hours 28 minutes | National Airspace System |
| 11 June 2026 | 4 hours 54 minutes | National Airspace System |
Delay causes
Why UA 555 runs late
National Airspace System accounts for 59% of the 9,233 delay minutes carriers reported here, and the remaining four split what is left.
- 59%National Airspace System
- 32%Late-arriving aircraft
- 9%Carrier
59% 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 5,423 minutes out of 9,233, against a national NAS share of 21%. The split is drawn from 9,233 delay minutes reported on UA 555.
Cancellations run at 4.85%, against 1.89% nationally. That is about one flight in twenty 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
16.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
The same number turns up on twelve other city pairs in the data, including EWR to PHX (56), EWR to PWM (36) and PHX to ORD (16), 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. 309 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: 4.85% of its 309 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 2397 on the same route85.3%
- Delta Air Lines 2322 on the same route74.5%
- Delta Air Lines 2312 on the same route71.6%
- Frontier Airlines 4602 on the same route55.4%
- Delta Air Lines 2498 on the same route53.8%
- Frontier Airlines 1158 on the same route61.9%
- 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
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.