Flight number record
UA 632
United Airlines · Atlanta to Washington
- Route
- ATL → IAD
- Departs
- 09:35
- Flights
- 318
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 632, check with United Airlines.
UA 632 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 77.6%. When something does go wrong the average delay runs about 50 minutes. That rests on 318 flights, with a median arrival 8 minutes early.
Set against the rest of the country, UA 632's record is 9 points better than the US average of 77.6%. That gap is worth roughly 87 fewer late arrivals for every thousand flights.
Key figures
On time
86.3%
Arrivals under 15 minutes late, of 315 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
0.94%
National rate is 1.81%
1 hour+ late
3.5%
National rate is 8.1%
These figures cover 318 flights between July 2025 and June 2026. The median arrival is 8 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 632 flies
UA 632 flies ATL to IAD without a single fixed slot. Its most common scheduled departure was 09:35, used on 114 of 318 flights, with 09:52 (52 flights) and 09:20 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 09:35114 flights35.8%
- Departs 09:5252 flights16.4%
- Departs 09:2049 flights15.4%
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 09:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and UA 632 runs 2 points better at 86.3%. 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 632 next to ATL to IAD
Every carrier on ATL to IAD combined arrived on time 76.5% of the time across 3,979 flights, so UA 632 is 10 points ahead of it. United flew 1,099 flights on the same city pair under all its flight numbers, including this one, and those ran 81.4% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 632thin sample | 318 | 86.3% | 49 min | 0.94% | A+ |
| All United Airlines on ATL–IAD | 1,099 | 81.4% | 83 min | 0.55% | B+ |
| All carriers on ATL–IAD | 3,979 | 76.5% | 81 min | 1.99% | B |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 632 quarter by quarter
Quarter by quarter UA 632 held fairly steady: 87.0% in Jul–Sep 2025, 84.7% in Oct–Dec 2025, 81.8% in Jan–Mar 2026 and 91.7% in Apr–Jun 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202592 flights87.0%
- Oct–Dec 202585 flights84.7%
- Jan–Mar 202668 flights81.8%
- Apr–Jun 202673 flights91.7%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, UA 632 did best on Tuesday at 92.7% on time and worst on Thursday at 80.4%. Each day rests on about 45 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 632 runs late
One category carries most of the weight here. Carrier accounts for 44% of the 2,121 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.
- 44%Carrier
- 36%Late-arriving aircraft
- 19%National Airspace System
- 1%Extreme weather
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,121 reported delay minutes here, that single category outweighs weather by 36 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,121 delay minutes reported on UA 632.
Cancellations sit at 0.94% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.5% 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 534 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 one other city pair in the data, including IAD to BDL (90), but none flew often enough under UA 632 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to IAD only.
One caution: this is a thin sample. 318 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 632
For a booking, UA 632 has one of the better records a US domestic flight can show: 86.3% on time and 0.94% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- ATL to IAD, every carrier and departure
- IAD to ATL, the return direction
- United Airlines 1831 on the same route77.2%
- Delta Air Lines 2549 on the same route75.0%
- United Airlines 2634 on the same route76.8%
- Delta Air Lines 1309 on the same route73.5%
- Frontier Airlines 1082 on the same route58.8%
- Hartsfield-Jackson Atlanta International (ATL) 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
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.