Flight number record

UA 777

United Airlines · Chicago to Las Vegas

Route: ORD → LAS
Departs: 19:45
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 777, check with United Airlines.

UA 777 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 364 flights, with a median arrival 3 minutes early.

On time

74.7%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

10.3%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 10.3% 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 777 flies

UA 777 flies ORD to LAS without a single fixed slot. Its most common scheduled departure was 19:45, used on 61 of 364 flights, with 16:15 (60 flights) and 13:10 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:4561 flights16.8%
Departs 16:1560 flights16.5%
Departs 13:1037 flights10.2%

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 19:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 777 runs 7 points better at 74.7%. 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 777 next to ORD to LAS

Every carrier on ORD to LAS combined arrived on time 73.7% of the time across 5,297 flights, so UA 777 is about level with it. United flew 2,328 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 trails by 4 points.

UA 777 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 777thin sample	364	74.7%	79 min	0.55%	C+
All United Airlines on ORD–LAS	2,328	79.6%	64 min	0.43%	B+
All carriers on ORD–LAS	5,297	73.7%	72 min	1.32%	C
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 777 quarter by quarter

Quarter by quarter UA 777 held fairly steady: 77.8% in Jul–Sep 2025, 72.5% in Oct–Dec 2025, 75.3% in Jan–Mar 2026 and 73.3% in Apr–Jun 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights77.8%
Oct–Dec 202591 flights72.5%
Jan–Mar 202690 flights75.3%
Apr–Jun 202691 flights73.3%

Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, UA 777 did best on Tuesday at 86.5% on time and worst on Monday at 65.4%. Each day rests on about 52 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 777 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 47% of the 7,203 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
47%
National Airspace System
21%
Carrier
20%
Extreme weather
12%

Extreme weather accounts for 12% 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 1.9 times the usual weather exposure. The split is drawn from 7,203 delay minutes reported on UA 777.

Cancellations are rare at 0.55%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.3% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

At 1,514 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 seven other city pairs in the data, including ROC to ORD (36), SAV to ORD (20) and LGA to ORD (15), but none flew often enough under UA 777 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to LAS only.

One caution: this is a thin sample. 364 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 777

For a booking, read UA 777 as 74.7% on time with 0.55% cancelled over 364 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