Flight number record
UA 1073
United Airlines · Washington to Miami
- Route
- IAD → MIA
- Departs
- 08:45
- Flights
- 328
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1073, check with United Airlines.
UA 1073 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 328 flights, with a median arrival 9 minutes early.
Set against the rest of the country, UA 1073's record is 9 points better than the US average of 77.3%. That gap is worth roughly 92 fewer late arrivals for every thousand flights.
Key figures
On time
86.5%
Arrivals under 15 minutes late, of 325 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
0.61%
National rate is 1.89%
1 hour+ late
3.4%
National rate is 8.3%
These figures cover 328 flights between September 2025 and August 2026. The median arrival is 9 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 1073 flies
UA 1073 flies IAD to MIA without a single fixed slot. Its most common scheduled departure was 08:45, used on 101 of 328 flights, with 08:25 (61 flights) and 08:15 (57 flights) next.
- Departs 08:45101 flights30.8%
- Departs 08:2561 flights18.6%
- Departs 08:1557 flights17.4%
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 08:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 1073 runs 3 points better at 86.5%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
UA 1073 next to IAD to MIA
Every carrier on IAD to MIA combined arrived on time 84.4% of the time across 603 flights, so UA 1073 is 2 points ahead of it. United flew 512 flights on the same city pair under all its flight numbers, including this one, and those ran 86.4% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1073thin sample | 328 | 86.5% | 53 min | 0.61% | A+ |
| All United Airlines on IAD–MIA | 512 | 86.4% | 63 min | 0.59% | A+ |
| All carriers on IAD–MIA | 603 | 84.4% | 62 min | 0.83% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1073 quarter by quarter
UA 1073 did not run the same all year. Its best quarter was Apr–Jun 2026 at 94.0% on time and its weakest Oct–Dec 2025 at 76.1%, a swing of 18 points on roughly 82 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 202524 flights—
- Oct–Dec 202567 flights76.1%
- Jan–Mar 202690 flights79.5%
- Apr–Jun 202685 flights94.0%
- Jul–Sep 202662 flights91.9%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1073 ranged from 80.9% on Thursday to 91.5% on Friday. With about 47 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 1073 runs when it is late
UA 1073 often beats the schedule: 118 of 325 completed flights, 36%, arrived 15 minutes or more early. The 44 late arrivals split 21 under half an hour, 12 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early118 flights36.3%
- Within 15 min163 flights50.2%
- 15–29 min late21 flights6.5%
- 30–59 min late12 flights3.7%
- 1–2 hours late7 flights2.2%
- 2+ hours late4 flights1.2%
Scale runs 0% to 100%.
Share of 325 completed flights by arrival against schedule.
Only 19 of 325 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 1073
The latest arrival of the period was on 3 November 2025, 6 hours 6 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across November, March and April, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 November 2025 | 6 hours 6 minutes | Late-arriving aircraft |
| 19 March 2026 | 3 hours 31 minutes | Carrier |
| 16 March 2026 | 2 hours 8 minutes | National Airspace System |
| 14 November 2025 | 2 hours 6 minutes | Carrier |
| 7 April 2026 | 1 hour 57 minutes | National Airspace System |
Delay causes
Why UA 1073 runs late
National Airspace System accounts for 57% of the 2,351 delay minutes carriers reported here, and the remaining four split what is left.
- 57%National Airspace System
- 28%Carrier
- 15%Late-arriving aircraft
57% 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 1,344 minutes out of 2,351, against a national NAS share of 21%. The split is drawn from 2,351 delay minutes reported on UA 1073.
Cancellations are rare at 0.61%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.4% 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 922 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 two other city pairs in the data, including CLE to IAD (31) and ORD to RNO (6), but none flew often enough under UA 1073 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to MIA only.
One caution: this is a thin sample. 328 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 1073
For a booking, UA 1073 has one of the better records a US domestic flight can show: 86.5% on time and 0.61% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- Washington Dulles International (IAD) delay statistics
- Miami International (MIA) 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
- Worst months to fly in the US, ranked by the data
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.