Flight number record

UA 1971

United Airlines · Houston to Las Vegas

Route: IAH → LAS
Departs: 14:20
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1971, check with United Airlines.

UA 1971 lands a B+, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 11 minutes early.

Set against the rest of the country, UA 1971's record is 6 points better than the US average of 77.6%. That gap is worth roughly 56 fewer late arrivals for every thousand flights.

On time

83.2%

Arrivals under 15 minutes late, of 364 completed flights

Avg delay

76 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

8.5%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. Beyond the headline rate, 8.5% 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 1971 flies

UA 1971 flies IAH to LAS without a single fixed slot. Its most common scheduled departure was 14:20, used on 154 of 365 flights, with 14:25 (44 flights) and 14:26 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 14:20154 flights42.2%
Departs 14:2544 flights12.1%
Departs 14:2637 flights10.1%

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 14:20 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 1971 runs 11 points better at 83.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

UA 1971 next to IAH to LAS

Every carrier on IAH to LAS combined arrived on time 82.4% of the time across 3,457 flights, so UA 1971 is about level with it. United flew 2,602 flights on the same city pair under all its flight numbers, including this one, and those ran 83.9% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 4 points.

UA 1971 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1971	365	83.2%	76 min	0.00%	B+
All United Airlines on IAH–LAS	2,602	83.9%	59 min	0.38%	B+
All carriers on IAH–LAS	3,457	82.4%	72 min	0.81%	B+
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1971 quarter by quarter

UA 1971 did not run the same all year. Its best quarter was Oct–Dec 2025 at 93.5% on time and its weakest Jul–Sep 2025 at 73.6%, a swing of 20 points on roughly 91 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 202592 flights73.6%
Oct–Dec 202592 flights93.5%
Jan–Mar 202690 flights86.7%
Apr–Jun 202691 flights79.1%

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

By weekday, UA 1971 did best on Wednesday at 90.4% on time and worst on Saturday at 76.9%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1971 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 46% of the 4,663 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.

Late-arriving aircraft
46%
Carrier
31%
National Airspace System
15%
Extreme weather
8%

46% 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 4,663 reported delay minutes here, that single category outweighs weather by 6 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 4,663 delay minutes reported on UA 1971.

Cancellations are rare at 0.00%, below the national 1.81% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

8.5% 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 a little over an hour, which a normal layover absorbs.

The 1,222 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 two other city pairs in the data, including LAS to ORD (32) and TPA to IAH (20), but none flew often enough under UA 1971 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAH to LAS only.

One caution: this is a thin sample. 365 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 1971

For a booking, read UA 1971 as 83.2% on time with 0.00% cancelled over 365 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