Flight number record
UA 777
United Airlines · Chicago to Las Vegas
- Route
- ORD → LAS
- Departs
- 16:15
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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, 2 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 364 flights, with a median arrival 4 minutes early.
Key figures
On time
74.9%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
72 min
Across delayed arrivals only, not all flights
Cancelled
0.55%
National rate is 1.89%
1 hour+ late
9.2%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. Beyond the headline rate, 9.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 777 flies
UA 777 flies ORD to LAS without a single fixed slot. Its most common scheduled departure was 16:15, used on 60 of 364 flights, with 19:45 (48 flights) and 12:40 (41 flights) next.
- Departs 16:1560 flights16.5%
- Departs 19:4548 flights13.2%
- Departs 12:4041 flights11.3%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 16:15 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 777 runs 3 points better at 74.9%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 777 next to ORD to LAS
Every carrier on ORD to LAS combined arrived on time 72.9% of the time across 5,154 flights, so UA 777 is 2 points ahead of it. United flew 2,354 flights on the same city pair under all its flight numbers, including this one, and those ran 79.5% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 777thin sample | 364 | 74.9% | 72 min | 0.55% | C+ |
| All United Airlines on ORD–LAS | 2,354 | 79.5% | 68 min | 0.30% | B+ |
| All carriers on ORD–LAS | 5,154 | 72.9% | 75 min | 1.34% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 777 quarter by quarter
Quarter by quarter UA 777 held fairly steady: 76.7% in Jul–Sep 2025, 72.5% in Oct–Dec 2025, 75.3% in Jan–Mar 2026, 73.3% in Apr–Jun 2026 and 79.7% in Jul–Sep 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 202530 flights76.7%
- Oct–Dec 202591 flights72.5%
- Jan–Mar 202690 flights75.3%
- Apr–Jun 202691 flights73.3%
- Jul–Sep 202662 flights79.7%
Scale runs 65% to 85%.
By weekday, UA 777 did best on Tuesday at 86.5% on time and worst on Monday at 63.5%. Each day rests on about 52 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 777 runs when it is late
The 90 late arrivals split 34 under half an hour, 23 between 30 and 60 minutes, and 33 an hour or more.
- 15+ min early82 flights22.8%
- Within 15 min187 flights52.1%
- 15–29 min late34 flights9.5%
- 30–59 min late23 flights6.4%
- 1–2 hours late19 flights5.3%
- 2+ hours late14 flights3.9%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
19 of 90 late departures made up the time and arrived on time, 21% of them. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAS.
The worst days
Worst days for UA 777
The latest arrival of the period was on 11 June 2026, 6 hours 32 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 June 2026 | 6 hours 32 minutes | Late-arriving aircraft |
| 15 March 2026 | 5 hours 44 minutes | Late-arriving aircraft |
| 29 November 2025 | 5 hours 25 minutes | Late-arriving aircraft |
| 2 April 2026 | 5 hours 16 minutes | Late-arriving aircraft |
| 26 January 2026 | 4 hours 2 minutes | Extreme weather |
Delay causes
Why UA 777 runs late
Late-arriving aircraft accounts for 42% of the 6,436 delay minutes carriers reported here, and the remaining four split what is left.
- 42%Late-arriving aircraft
- 26%National Airspace System
- 22%Carrier
- 10%Extreme weather
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,436 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 6,436 delay minutes reported on UA 777.
Cancellations are rare at 0.55%, below the national 1.89% 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
9.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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 six other city pairs in the data, including ROC to ORD (36), SAV to ORD (20) and SRQ to ORD (3), 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 74.9% on time with 0.55% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ORD to LAS, every carrier and departure
- LAS to ORD, the return direction
- United Airlines 574 on the same route96.9%
- United Airlines 2440 on the same route84.1%
- Chicago O'Hare International (ORD) delay statistics
- Harry Reid International (LAS) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.