Flight number record

UA 2337

United Airlines · Washington to Austin

Route: IAD → AUS
Departs: 17:55
Flights: 272
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2337, check with United Airlines.

UA 2337 lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 272 flights, with a median arrival 7 minutes early.

On time

79.2%

Arrivals under 15 minutes late, of 269 completed flights

Avg delay

68 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.81%

1 hour+ late

8.2%

National rate is 8.1%

These figures cover 272 flights between July 2025 and June 2026. Beyond the headline rate, 8.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When UA 2337 flies

UA 2337 is scheduled to leave Washington (IAD) at 17:55 local time and reach Austin (AUS) at 20:43. That slot held for 231 of the 272 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 17:55231 flights84.9%
Departs 18:0041 flights15.1%

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 17:55 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 2337 runs 11 points better at 79.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

UA 2337 next to IAD to AUS

Every carrier on IAD to AUS combined arrived on time 83.9% of the time across 1,049 flights, so UA 2337 is 5 points behind it. United flew 1,007 flights on the same city pair under all its flight numbers, including this one, and those ran 84.2% on time. Across its whole network United Airlines managed 79.0%, close to this flight's figure.

UA 2337 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2337thin sample	272	79.2%	68 min	1.10%	B
All United Airlines on IAD–AUS	1,007	84.2%	67 min	0.79%	B+
All carriers on IAD–AUS	1,049	83.9%	66 min	0.76%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 2337 quarter by quarter

Quarter by quarter UA 2337 held fairly steady: 82.0% in Oct–Dec 2025, 80.5% in Jan–Mar 2026 and 74.7% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 20256 flights—
Oct–Dec 202589 flights82.0%
Jan–Mar 202689 flights80.5%
Apr–Jun 202688 flights74.7%

Scale runs 65% 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 74.4%. Each day rests on about 39 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 2337 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 3,802 reported delay minutes.

Late-arriving aircraft
41%
National Airspace System
24%
Carrier
24%
Extreme weather
10%

41% 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 3,802 reported delay minutes here, that single category outweighs weather by 4 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 3,802 delay minutes reported on UA 2337.

Cancellations sit at 1.10% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.2% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

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. 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 EWR to ORD (86), ORD to IAD (49) and BUF to ORD (25), 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. 272 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, read UA 2337 as 79.2% on time with 1.10% cancelled over 272 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

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.

Key figures