Flight number record
UA 2639
United Airlines · Dallas-Fort Worth to Washington
- Route
- DFW → IAD
- Departs
- 07:25
- Flights
- 281
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2639, check with United Airlines.
UA 2639 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 281 flights, with a median arrival 11 minutes early.
Set against the rest of the country, UA 2639's record is 13 points better than the US average of 77.3%. That gap is worth roughly 133 fewer late arrivals for every thousand flights.
Key figures
On time
90.6%
Arrivals under 15 minutes late, of 277 completed flights
Avg delay
73 min
Across delayed arrivals only, not all flights
Cancelled
1.42%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 281 flights between September 2025 and August 2026. The median arrival is 11 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 2639 flies
UA 2639 flies DFW to IAD without a single fixed slot. Its most common scheduled departure was 07:25, used on 137 of 281 flights, with 07:20 (91 flights) and 07:45 (31 flights) next.
- Departs 07:25137 flights48.8%
- Departs 07:2091 flights32.4%
- Departs 07:4531 flights11.0%
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 07:25 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 2639 runs level with that at 90.6%. 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 2639 next to DFW to IAD
Every carrier on DFW to IAD combined arrived on time 77.4% of the time across 1,962 flights, so UA 2639 is 13 points ahead of it. United flew 929 flights on the same city pair under all its flight numbers, including this one, and those ran 83.6% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2639thin sample | 281 | 90.6% | 73 min | 1.42% | A |
| All United Airlines on DFW–IAD | 929 | 83.6% | 80 min | 0.86% | B+ |
| All carriers on DFW–IAD | 1,962 | 77.4% | 77 min | 1.73% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2639 quarter by quarter
UA 2639 did not run the same all year. Its best quarter was Jul–Sep 2026 at 97.7% on time and its weakest Oct–Dec 2025 at 86.1%, a swing of 12 points on roughly 70 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 202517 flights—
- Oct–Dec 202572 flights86.1%
- Jan–Mar 202672 flights94.2%
- Apr–Jun 202676 flights86.8%
- Jul–Sep 202644 flights97.7%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2639 ranged from 85.7% on Thursday to 94.1% on Friday. With about 40 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 2639 runs when it is late
UA 2639 often beats the schedule: 105 of 277 completed flights, 38%, arrived 15 minutes or more early. The 26 late arrivals split 11 under half an hour, 8 between 30 and 60 minutes, and 7 an hour or more.
- 15+ min early105 flights37.9%
- Within 15 min146 flights52.7%
- 15–29 min late11 flights4.0%
- 30–59 min late8 flights2.9%
- 1–2 hours late3 flights1.1%
- 2+ hours late4 flights1.4%
Scale runs 0% to 100%.
Share of 277 completed flights by arrival against schedule.
Only 17 of 277 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 2639
The latest arrival of the period was on 16 October 2025, 7 hours 47 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 October 2025 | 7 hours 47 minutes | Carrier |
| 20 May 2026 | 3 hours 49 minutes | Carrier |
| 19 June 2026 | 3 hours 14 minutes | Extreme weather |
| 16 March 2026 | 3 hours 10 minutes | Carrier |
| 23 December 2025 | 1 hour 37 minutes | Carrier |
Delay causes
Why UA 2639 runs late
Carrier accounts for 60% of the 1,908 delay minutes carriers reported here, and the remaining four split what is left.
- 60%Carrier
- 24%National Airspace System
- 16%Extreme weather
Extreme weather accounts for 16% 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 2.6 times the usual weather exposure. The split is drawn from 1,908 delay minutes reported on UA 2639.
Cancellations sit at 1.42% 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 2.5% 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 1,172 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 three other city pairs in the data, including IAD to FLL (123), MEM to IAH (6) and LAS to EWR (1), but none flew often enough under UA 2639 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DFW to IAD only.
One caution: this is a thin sample. 281 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 2639
For a booking, UA 2639 has one of the better records a US domestic flight can show: 90.6% on time and 1.42% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DFW to IAD, every carrier and departure
- IAD to DFW, the return direction
- United Airlines 1240 on the same route77.5%
- United Airlines 358 on the same route83.6%
- Dallas/Fort Worth International (DFW) 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
- Late aircraft, weather, or the airline: what actually causes US flight delays
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.