Flight number record
UA 1877
United Airlines · Grand Junction to Denver
- Route
- GJT → DEN
- Departs
- 07:00
- Flights
- 323
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1877, check with United Airlines.
UA 1877 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 45 minutes. That rests on 323 flights, with a median arrival 13 minutes early.
Set against the rest of the country, UA 1877's record is 9 points better than the US average of 77.3%. That gap is worth roughly 90 fewer late arrivals for every thousand flights.
Key figures
On time
86.3%
Arrivals under 15 minutes late, of 321 completed flights
Avg delay
46 min
Across delayed arrivals only, not all flights
Cancelled
0.62%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 323 flights between September 2025 and August 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.
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Schedule
When UA 1877 flies
UA 1877 flies GJT to DEN without a single fixed slot. Its most common scheduled departure was 07:00, used on 196 of 323 flights.
- Departs 07:00196 flights60.7%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and UA 1877 runs 3 points worse at 86.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
UA 1877 next to GJT to DEN
Every carrier on GJT to DEN combined arrived on time 79.6% of the time across 2,282 flights, so UA 1877 is 7 points ahead of it. United flew 732 flights on the same city pair under all its flight numbers, including this one, and those ran 85.0% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1877thin sample | 323 | 86.3% | 46 min | 0.62% | A+ |
| All United Airlines on GJT–DEN | 732 | 85.0% | 61 min | 0.41% | A+ |
| All carriers on GJT–DEN | 2,282 | 79.6% | 75 min | 1.36% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 1877 quarter by quarter
UA 1877 did not run the same all year. Its best quarter was Jul–Sep 2026 at 90.2% on time and its weakest Jul–Sep 2025 at 76.7%, a swing of 14 points on roughly 65 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 202530 flights76.7%
- Oct–Dec 202592 flights82.6%
- Jan–Mar 202669 flights88.4%
- Apr–Jun 202670 flights89.9%
- Jul–Sep 202662 flights90.2%
Scale runs 70% to 95%.
By weekday, UA 1877 did best on Thursday at 93.5% on time and worst on Saturday at 73.3%. Each day rests on about 46 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1877 runs when it is late
UA 1877 often beats the schedule: 144 of 321 completed flights, 45%, arrived 15 minutes or more early. The 44 late arrivals split 21 under half an hour, 15 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early144 flights44.9%
- Within 15 min133 flights41.4%
- 15–29 min late21 flights6.5%
- 30–59 min late15 flights4.7%
- 1–2 hours late4 flights1.2%
- 2+ hours late4 flights1.2%
Scale runs 0% to 100%.
Share of 321 completed flights by arrival against schedule.
6 of 21 late departures made up the time and arrived on time, 29% of them. In the other direction, 29 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 DEN.
The worst days
Worst days for UA 1877
The latest arrival of the period was on 3 April 2026, 6 hours 35 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 3 April 2026 | 6 hours 35 minutes | Carrier |
| 25 May 2026 | 2 hours 11 minutes | Carrier |
| 4 April 2026 | 2 hours 7 minutes | Carrier |
| 18 December 2025 | 2 hours 5 minutes | Late-arriving aircraft |
| 17 July 2026 | 1 hour 20 minutes | Carrier |
Delay causes
Why UA 1877 runs late
Carrier accounts for 53% of the 2,026 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Carrier
- 41%National Airspace System
- 7%Late-arriving aircraft
41% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 822 minutes out of 2,026, against a national NAS share of 21%. The split is drawn from 2,026 delay minutes reported on UA 1877.
Cancellations are rare at 0.62%, 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
Badly late arrivals are rare here: only 2.5% land an hour or more behind schedule, against 8.3% 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 four other city pairs in the data, including DEN to IAD (32), DEN to BIL (31) and DEN to IND (21), but none flew often enough under UA 1877 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to GJT to DEN only.
One caution: this is a thin sample. 323 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 1877
For a booking, UA 1877 has one of the better records a US domestic flight can show: 86.3% on time and 0.62% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- GJT to DEN, every carrier and departure
- DEN to GJT, the return direction
- SkyWest Airlines 4709 on the same route84.3%
- SkyWest Airlines 5755 on the same route64.3%
- SkyWest Airlines 4635 on the same route67.6%
- SkyWest Airlines 4800 on the same route87.4%
- Denver International (DEN) 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
- Worst months to fly in the US, ranked by the data
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.