Flight number record
UA 1073
United Airlines · Washington to Miami
- Route
- IAD → MIA
- Departs
- 08:25
- Flights
- 328
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 328 flights, with a median arrival 9 minutes early.
Set against the rest of the country, UA 1073's record is 8 points better than the US average of 77.6%. That gap is worth roughly 76 fewer late arrivals for every thousand flights.
Key figures
On time
85.2%
Arrivals under 15 minutes late, of 325 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
0.61%
National rate is 1.81%
1 hour+ late
4.3%
National rate is 8.1%
These figures cover 328 flights between July 2025 and June 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.
Schedule
When UA 1073 flies
UA 1073 flies IAD to MIA without a single fixed slot. Its most common scheduled departure was 08:25, used on 61 of 328 flights, with 08:45 (60 flights) and 08:15 (57 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 08:2561 flights18.6%
- Departs 08:4560 flights18.3%
- Departs 08:1557 flights17.4%
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 08:25 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and UA 1073 runs level with that at 85.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
UA 1073 next to IAD to MIA
Every carrier on IAD to MIA combined arrived on time 81.3% of the time across 646 flights, so UA 1073 is 4 points ahead of it. United flew 512 flights on the same city pair under all its flight numbers, including this one, and those ran 85.6% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1073thin sample | 328 | 85.2% | 63 min | 0.61% | A+ |
| All United Airlines on IAD–MIA | 512 | 85.6% | 69 min | 0.59% | A+ |
| All carriers on IAD–MIA | 646 | 81.3% | 70 min | 1.08% | B |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | 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 202586 flights89.5%
- Oct–Dec 202567 flights76.1%
- Jan–Mar 202690 flights79.5%
- Apr–Jun 202685 flights94.0%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1073 ranged from 78.7% on Thursday to 88.9% on Wednesday. With about 47 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.
Delay causes
Why UA 1073 runs late
One category carries most of the weight here. National Airspace System accounts for 51% of the 2,998 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.
- 51%National Airspace System
- 27%Late-arriving aircraft
- 22%Carrier
51% 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 1,520 minutes out of 2,998, against a national NAS share of 21%. The split is drawn from 2,998 delay minutes reported on UA 1073.
Cancellations are rare at 0.61%, below the national 1.81% 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 4.3% land an hour or more behind schedule, against 8.1% 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. 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 four other city pairs in the data, including CLE to IAD (31), MIA to DEN (31) and DEN to RNO (29), 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: 85.2% 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.