Flight number record

UA 1966

United Airlines · Austin to Houston

Route: AUS → IAH
Departs: 05:30
Flights: 311
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1966, check with United Airlines.

UA 1966 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 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 311 flights, with a median arrival 13 minutes early.

Set against the rest of the country, UA 1966's record is 16 points better than the US average of 77.6%. That gap is worth roughly 155 fewer late arrivals for every thousand flights.

On time

93.1%

Arrivals under 15 minutes late, of 304 completed flights

Avg delay

97 min

Across delayed arrivals only, not all flights

Cancelled

2.25%

National rate is 1.81%

1 hour+ late

3.0%

National rate is 8.1%

These figures cover 311 flights between July 2025 and June 2026. The median arrival is 13 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 1966 flies

UA 1966 flies AUS to IAH without a single fixed slot. Its most common scheduled departure was 05:30, used on 232 of 311 flights, with 05:00 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:30232 flights74.6%
Departs 05:0041 flights13.2%

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 05:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 1966 runs 4 points better at 93.1%. 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 1966 next to AUS to IAH

Every carrier on AUS to IAH combined arrived on time 75.6% of the time across 2,674 flights, so UA 1966 is 18 points ahead of it. United flew 2,608 flights on the same city pair under all its flight numbers, including this one, and those ran 75.5% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 14 points.

UA 1966 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1966thin sample	311	93.1%	97 min	2.25%	A
All United Airlines on AUS–IAH	2,608	75.5%	61 min	1.27%	B
All carriers on AUS–IAH	2,674	75.6%	62 min	1.23%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1966 quarter by quarter

UA 1966 did not run the same all year. Its best quarter was Jan–Mar 2026 at 97.7% on time and its weakest Jul–Sep 2025 at 84.8%, a swing of 13 points on roughly 78 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 202547 flights84.8%
Oct–Dec 202591 flights95.6%
Jan–Mar 202689 flights97.7%
Apr–Jun 202684 flights90.1%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1966 did best on Friday at 100.0% on time and worst on Sunday at 86.5%. Each day rests on about 44 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1966 runs late

One category carries most of the weight here. Carrier accounts for 86% of the 2,042 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
86%
National Airspace System
10%
Extreme weather
4%

The largest share of delay minutes, 86%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,752 of the 2,042 delay minutes reported here. The split is drawn from 2,042 delay minutes reported on UA 1966.

Cancellations sit at 2.25% 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 3.0% 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 same number turns up on six other city pairs in the data, including IAH to LGA (136), IAH to MIA (123) and IAH to SAT (31), but none flew often enough under UA 1966 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to AUS to IAH only.

One caution: this is a thin sample. 311 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 1966

For a booking, read UA 1966 as 93.1% on time with 2.25% cancelled over 311 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