Flight number record
UA 2739
United Airlines · Washington to Atlanta
- Route
- IAD → ATL
- Departs
- 08:15
- Flights
- 259
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2739, check with United Airlines.
UA 2739 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 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 259 flights, with a median arrival 14 minutes early.
Set against the rest of the country, UA 2739's record is 13 points better than the US average of 77.6%. That gap is worth roughly 127 fewer late arrivals for every thousand flights.
Key figures
On time
90.3%
Arrivals under 15 minutes late, of 258 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
0.39%
National rate is 1.81%
1 hour+ late
4.3%
National rate is 8.1%
These figures cover 259 flights between July 2025 and June 2026. The median arrival is 14 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 2739 flies
UA 2739 flies IAD to ATL without a single fixed slot. Its most common scheduled departure was 08:15, used on 116 of 259 flights, with 08:20 (39 flights) and 08:16 (35 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 08:15116 flights44.8%
- Departs 08:2039 flights15.1%
- Departs 08:1635 flights13.5%
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 08:15 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and UA 2739 runs 6 points better at 90.3%. 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 2739 next to IAD to ATL
Every carrier on IAD to ATL combined arrived on time 79.2% of the time across 3,976 flights, so UA 2739 is 11 points ahead of it. United flew 1,097 flights on the same city pair under all its flight numbers, including this one, and those ran 80.9% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2739thin sample | 259 | 90.3% | 84 min | 0.39% | A+ |
| All United Airlines on IAD–ATL | 1,097 | 80.9% | 89 min | 0.46% | B+ |
| All carriers on IAD–ATL | 3,976 | 79.2% | 88 min | 2.06% | B |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 2739 quarter by quarter
UA 2739 did not run the same all year. Its best quarter was Apr–Jun 2026 at 95.2% on time and its weakest Oct–Dec 2025 at 84.7%, a swing of 11 points on roughly 65 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 202543 flights93.0%
- Oct–Dec 202585 flights84.7%
- Jan–Mar 202668 flights91.0%
- Apr–Jun 202663 flights95.2%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2739 did best on Thursday at 97.4% on time and worst on Tuesday at 81.2%. Each day rests on about 37 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 2739 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 2,106 reported delay minutes.
- 39%National Airspace System
- 32%Late-arriving aircraft
- 29%Carrier
39% 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 820 minutes out of 2,106, against a national NAS share of 21%. The split is drawn from 2,106 delay minutes reported on UA 2739.
Cancellations are rare at 0.39%, 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 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 four other city pairs in the data, including SLC to SFO (1), DEN to DAY (1) and ORD to DTW (1), but none flew often enough under UA 2739 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to ATL only.
One caution: this is a thin sample. 259 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 2739
For a booking, UA 2739 has one of the better records a US domestic flight can show: 90.3% on time and 0.39% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- IAD to ATL, every carrier and departure
- ATL to IAD, the return direction
- Frontier Airlines 4707 on the same route70.1%
- United Airlines 2081 on the same route68.9%
- Delta Air Lines 1354 on the same route81.4%
- United Airlines 471 on the same route85.5%
- Washington Dulles International (IAD) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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.