Flight number record
UA 632
United Airlines · Atlanta to Washington
- Route
- ATL → IAD
- Departs
- 09:35
- Flights
- 298
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 632, check with United Airlines.
UA 632 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 298 flights, with a median arrival 7 minutes early.
Set against the rest of the country, UA 632's record is 10 points better than the US average of 77.3%. That gap is worth roughly 97 fewer late arrivals for every thousand flights.
Key figures
On time
87.0%
Arrivals under 15 minutes late, of 293 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
1.68%
National rate is 1.89%
1 hour+ late
3.8%
National rate is 8.3%
These figures cover 298 flights between September 2025 and August 2026. The median arrival is 7 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 101 of 298 flights, with 09:52 (52 flights) and 09:25 (45 flights) next.
- Departs 09:35101 flights33.9%
- Departs 09:5252 flights17.4%
- Departs 09:2545 flights15.1%
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 09:35 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 632 runs 3 points better at 87.0%. 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 632 next to ATL to IAD
Every carrier on ATL to IAD combined arrived on time 76.4% of the time across 4,005 flights, so UA 632 is 11 points ahead of it. United flew 1,091 flights on the same city pair under all its flight numbers, including this one, and those ran 81.6% 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 632thin sample | 298 | 87.0% | 63 min | 1.68% | A |
| All United Airlines on ATL–IAD | 1,091 | 81.6% | 78 min | 0.92% | B+ |
| All carriers on ATL–IAD | 4,005 | 76.4% | 79 min | 2.12% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 632 quarter by quarter
UA 632 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Jan–Mar 2026 at 81.8%, a swing of 15 points on roughly 60 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 202530 flights96.7%
- Oct–Dec 202585 flights84.7%
- Jan–Mar 202668 flights81.8%
- Apr–Jun 202673 flights91.7%
- Jul–Sep 202642 flights85.0%
Scale runs 75% to 100%.
By weekday, UA 632 ranged from 81.2% on Sunday to 92.3% on Tuesday. With about 43 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 632 runs when it is late
The 38 late arrivals split 15 under half an hour, 12 between 30 and 60 minutes, and 11 an hour or more.
- 15+ min early68 flights23.2%
- Within 15 min187 flights63.8%
- 15–29 min late15 flights5.1%
- 30–59 min late12 flights4.1%
- 1–2 hours late7 flights2.4%
- 2+ hours late4 flights1.4%
Scale runs 0% to 100%.
Share of 293 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 28 departures that left 15 minutes late or more, only 2 made it up before arrival. 12 flights left on time and still arrived late.
The worst days
Worst days for UA 632
The latest arrival of the period was on 19 August 2026, 9 hours 18 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 August 2026 | 9 hours 18 minutes | Carrier |
| 18 May 2026 | 3 hours 3 minutes | Late-arriving aircraft |
| 9 November 2025 | 2 hours 32 minutes | Carrier |
| 21 February 2026 | 2 hours 6 minutes | Late-arriving aircraft |
| 12 May 2026 | 1 hour 48 minutes | Late-arriving aircraft |
Delay causes
Why UA 632 runs late
Carrier accounts for 51% of the 2,375 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Carrier
- 30%Late-arriving aircraft
- 18%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 51%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,205 of the 2,375 delay minutes reported here. The split is drawn from 2,375 delay minutes reported on UA 632.
Cancellations sit at 1.68% against a national 1.89%, 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 3.8% 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 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.
The same number turns up on one other city pair in the data, including IAD to BDL (152), 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. 298 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, read UA 632 as 87.0% on time with 1.68% cancelled over 298 flights. Those are rates from the past twelve months, not a forecast for any particular 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 route76.2%
- Delta Air Lines 1695 on the same route75.6%
- Delta Air Lines 2549 on the same route72.8%
- United Airlines 2634 on the same route76.6%
- Delta Air Lines 1309 on the same route72.6%
- Delta Air Lines 1444 on the same route87.6%
- 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
- 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.