Flight number record
UA 1366
United Airlines · Newark to Washington
- Route
- EWR → IAD
- Departs
- 06:00
- Flights
- 350
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1366, check with United Airlines.
UA 1366 earns an A−. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 18 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 350 flights, with a median arrival 10 minutes early.
Set against the rest of the country, UA 1366's record is 18 points better than the US average of 77.3%. That gap is worth roughly 183 fewer late arrivals for every thousand flights.
Key figures
On time
95.6%
Arrivals under 15 minutes late, of 339 completed flights
Avg delay
94 min
Across delayed arrivals only, not all flights
Cancelled
3.14%
National rate is 1.89%
1 hour+ late
2.1%
National rate is 8.3%
These figures cover 350 flights between September 2025 and August 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When UA 1366 flies
UA 1366 is scheduled to leave Newark (EWR) at 06:00 local time and reach Washington (IAD) at 07:20. That slot held for 296 of the 350 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 06:00296 flights84.6%
- Departs 06:1052 flights14.9%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 1366 runs 6 points better at 95.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 1366 next to EWR to IAD
Every carrier on EWR to IAD combined arrived on time 74.8% of the time across 1,561 flights, so UA 1366 is 21 points ahead of it. United flew 1,532 flights on the same city pair under all its flight numbers, including this one, and those ran 74.8% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 17 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1366thin sample | 350 | 95.6% | 94 min | 3.14% | A− |
| All United Airlines on EWR–IAD | 1,532 | 74.8% | 72 min | 2.81% | C |
| All carriers on EWR–IAD | 1,561 | 74.8% | 71 min | 2.95% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1366 quarter by quarter
Quarter by quarter UA 1366 held fairly steady: 93.3% in Jul–Sep 2025, 94.4% in Oct–Dec 2025, 93.8% in Jan–Mar 2026, 100.0% in Apr–Jun 2026 and 94.5% in Jul–Sep 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202591 flights94.4%
- Jan–Mar 202686 flights93.8%
- Apr–Jun 202684 flights100.0%
- Jul–Sep 202659 flights94.5%
Scale runs 85% to 100%.
By weekday, UA 1366 ranged from 90.2% on Thursday to 100.0% on Monday. With about 50 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 1366 runs when it is late
UA 1366 often beats the schedule: 104 of 339 completed flights, 31%, arrived 15 minutes or more early. Most of the lateness is short. 8 of the 15 late arrivals were under half an hour behind, and 7 reached an hour or more.
- 15+ min early104 flights30.7%
- Within 15 min220 flights64.9%
- 15–29 min late8 flights2.4%
- 30–59 min late0 flights0.0%
- 1–2 hours late4 flights1.2%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 339 completed flights by arrival against schedule.
Only 13 of 339 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for UA 1366
The latest arrival of the period was on 14 December 2025, 7 hours 14 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across December, October and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 December 2025 | 7 hours 14 minutes | Extreme weather |
| 25 October 2025 | 3 hours 36 minutes | Carrier |
| 5 August 2026 | 3 hours 28 minutes | Late-arriving aircraft |
| 27 August 2026 | 1 hour 58 minutes | Carrier |
| 14 October 2025 | 1 hour 47 minutes | National Airspace System |
Delay causes
Why UA 1366 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 1,403 reported delay minutes.
- 37%National Airspace System
- 31%Carrier
- 25%Extreme weather
- 7%Late-arriving aircraft
Extreme weather accounts for 25% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 4.1 times the usual weather exposure. The split is drawn from 1,403 delay minutes reported on UA 1366.
Cancellations run at 3.14%, against 1.89% 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
Badly late arrivals are rare here: only 2.1% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The same number turns up on four other city pairs in the data, including IAD to BNA (162), BNA to IAH (63) and IAD to LAX (37), but none flew often enough under UA 1366 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to EWR to IAD only.
One caution: this is a thin sample. 350 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 1366
For a booking, the cancellation rate is the figure to plan around on UA 1366: 3.14% of its 350 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
- EWR to IAD, every carrier and departure
- IAD to EWR, the return direction
- United Airlines 1992 on the same route67.1%
- Newark Liberty International (EWR) delay statistics
- Washington Dulles International (IAD) 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
- What a cancellation rate actually tells you (and what it hides)
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.