Flight number record

UA 1155

United Airlines · Newark to Austin

Route: EWR → AUS
Departs: 11:59
Flights: 286
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1155, check with United Airlines.

UA 1155 earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 286 flights, with a median arrival 10 minutes early.

Set against the rest of the country, UA 1155's record is 7 points better than the US average of 77.6%. That gap is worth roughly 70 fewer late arrivals for every thousand flights.

On time

84.6%

Arrivals under 15 minutes late, of 280 completed flights

Avg delay

54 min

Across delayed arrivals only, not all flights

Cancelled

2.10%

National rate is 1.81%

1 hour+ late

3.6%

National rate is 8.1%

These figures cover 286 flights between July 2025 and June 2026. The median arrival is 10 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 1155 flies

UA 1155 flies EWR to AUS without a single fixed slot. Its most common scheduled departure was 11:59, used on 35 of 286 flights, with 13:00 (34 flights) and 12:20 (30 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:5935 flights12.2%
Departs 13:0034 flights11.9%
Departs 12:2030 flights10.5%

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 11:59 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and UA 1155 runs 6 points better at 84.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1155 next to EWR to AUS

Every carrier on EWR to AUS combined arrived on time 78.2% of the time across 2,107 flights, so UA 1155 is 6 points ahead of it. United flew 1,739 flights on the same city pair under all its flight numbers, including this one, and those ran 79.6% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 6 points.

UA 1155 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1155thin sample	286	84.6%	54 min	2.10%	B
All United Airlines on EWR–AUS	1,739	79.6%	77 min	1.73%	B
All carriers on EWR–AUS	2,107	78.2%	78 min	2.42%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1155 quarter by quarter

UA 1155 did not run the same all year. Its best quarter was Apr–Jun 2026 at 93.9% on time and its weakest Oct–Dec 2025 at 74.3%, a swing of 20 points on roughly 72 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 202555 flights83.3%
Oct–Dec 202575 flights74.3%
Jan–Mar 202674 flights85.7%
Apr–Jun 202682 flights93.9%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1155 did best on Wednesday at 94.6% on time and worst on Sunday at 79.1%. Each day rests on about 41 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1155 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 2,316 reported delay minutes.

Carrier
40%
National Airspace System
35%
Late-arriving aircraft
14%
Extreme weather
11%

Extreme weather accounts for 11% 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 1.8 times the usual weather exposure. The split is drawn from 2,316 delay minutes reported on UA 1155.

Cancellations sit at 2.10% against a national 1.81%, 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 3.6% 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.

At 1,504 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

The same number turns up on five other city pairs in the data, including RDU to EWR (37), IAD to EWR (16) and TYS to ORD (12), but none flew often enough under UA 1155 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to EWR to AUS only.

One caution: this is a thin sample. 286 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 1155

For a booking, read UA 1155 as 84.6% on time with 2.10% cancelled over 286 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