Flight number record
UA 2337
United Airlines · Washington to Austin
- Route
- IAD → AUS
- Departs
- 17:55
- Flights
- 334
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2337, check with United Airlines.
UA 2337 lands a B, level with the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 334 flights, with a median arrival 7 minutes early.
Key figures
On time
76.7%
Arrivals under 15 minutes late, of 330 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
1.20%
National rate is 1.89%
1 hour+ late
10.9%
National rate is 8.3%
These figures cover 334 flights between September 2025 and August 2026. Beyond the headline rate, 10.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 2337 flies
UA 2337 flies IAD to AUS without a single fixed slot. Its most common scheduled departure was 17:55, used on 231 of 334 flights, with 18:00 (103 flights) next.
- Departs 17:55231 flights69.2%
- Departs 18:00103 flights30.8%
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 17:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 2337 runs 9 points better at 76.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 2337 next to IAD to AUS
Every carrier on IAD to AUS combined arrived on time 83.8% of the time across 1,018 flights, so UA 2337 is 7 points behind it. United flew 987 flights on the same city pair under all its flight numbers, including this one, and those ran 84.5% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2337thin sample | 334 | 76.7% | 82 min | 1.20% | B |
| All United Airlines on IAD–AUS | 987 | 84.5% | 73 min | 0.81% | B+ |
| All carriers on IAD–AUS | 1,018 | 83.8% | 72 min | 0.79% | B+ |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2337 quarter by quarter
UA 2337 did not run the same all year. Its best quarter was Oct–Dec 2025 at 82.0% on time and its weakest Jul–Sep 2026 at 65.6%, a swing of 16 points on roughly 84 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 20256 flights—
- Oct–Dec 202589 flights82.0%
- Jan–Mar 202689 flights80.5%
- Apr–Jun 202688 flights74.7%
- Jul–Sep 202662 flights65.6%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2337 did best on Tuesday at 87.5% on time and worst on Sunday at 72.3%. Each day rests on about 48 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2337 runs when it is late
UA 2337 often beats the schedule: 103 of 330 completed flights, 31%, arrived 15 minutes or more early. The 77 late arrivals split 22 under half an hour, 19 between 30 and 60 minutes, and 36 an hour or more.
- 15+ min early103 flights31.2%
- Within 15 min150 flights45.5%
- 15–29 min late22 flights6.7%
- 30–59 min late19 flights5.8%
- 1–2 hours late17 flights5.2%
- 2+ hours late19 flights5.8%
Scale runs 0% to 100%.
Share of 330 completed flights by arrival against schedule.
16 of 72 late departures made up the time and arrived on time, 22% of them. In the other direction, 21 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at AUS.
The worst days
Worst days for UA 2337
The latest arrival of the period was on 27 August 2026, 7 hours 50 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 August 2026 | 7 hours 50 minutes | Late-arriving aircraft |
| 18 July 2026 | 5 hours 7 minutes | Late-arriving aircraft |
| 26 January 2026 | 4 hours 23 minutes | Late-arriving aircraft |
| 13 August 2026 | 3 hours 40 minutes | Late-arriving aircraft |
| 6 April 2026 | 3 hours 39 minutes | Late-arriving aircraft |
Delay causes
Why UA 2337 runs late
Late-arriving aircraft accounts for 49% of the 6,331 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Late-arriving aircraft
- 22%National Airspace System
- 22%Carrier
- 7%Extreme weather
49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,331 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 6,331 delay minutes reported on UA 2337.
Cancellations sit at 1.20% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
10.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 1,297 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 four other city pairs in the data, including ORD to IAD (31), BUF to ORD (25) and EWR to ORD (24), but none flew often enough under UA 2337 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to AUS only.
One caution: this is a thin sample. 334 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 2337
For a booking, UA 2337 is one of the weaker ways to fly IAD to AUS: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- IAD to AUS, every carrier and departure
- AUS to IAD, the return direction
- United Airlines 637 on the same route92.5%
- Washington Dulles International (IAD) delay statistics
- Austin-Bergstrom International (AUS) 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.