Flight number record

UA 1877

United Airlines · Grand Junction to Denver

Route: GJT → DEN
Departs: 07:00
Flights: 274
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1877, check with United Airlines.

UA 1877 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 50 minutes. That rests on 274 flights, with a median arrival 12 minutes early.

Set against the rest of the country, UA 1877's record is 7 points better than the US average of 77.6%. That gap is worth roughly 66 fewer late arrivals for every thousand flights.

On time

84.2%

Arrivals under 15 minutes late, of 273 completed flights

Avg delay

50 min

Across delayed arrivals only, not all flights

Cancelled

0.36%

National rate is 1.81%

1 hour+ late

2.9%

National rate is 8.1%

These figures cover 274 flights between July 2025 and June 2026. The median arrival is 12 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 1877 flies

UA 1877 flies GJT to DEN without a single fixed slot. Its most common scheduled departure was 07:00, used on 134 of 274 flights, with 07:20 (37 flights) and 07:01 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:00134 flights48.9%
Departs 07:2037 flights13.5%
Departs 07:0132 flights11.7%

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 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 5 points worse at 84.2%. 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 1877 next to GJT to DEN

Every carrier on GJT to DEN combined arrived on time 77.6% of the time across 2,229 flights, so UA 1877 is 7 points ahead of it. United flew 733 flights on the same city pair under all its flight numbers, including this one, and those ran 81.6% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 5 points.

UA 1877 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 1877thin sample	274	84.2%	50 min	0.36%	B+
All United Airlines on GJT–DEN	733	81.6%	69 min	0.41%	B+
All carriers on GJT–DEN	2,229	77.6%	75 min	1.48%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 1877 quarter by quarter

UA 1877 did not run the same all year. Its best quarter was Apr–Jun 2026 at 89.9% on time and its weakest Jul–Sep 2025 at 72.1%, a swing of 18 points on roughly 69 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 202543 flights72.1%
Oct–Dec 202592 flights82.6%
Jan–Mar 202669 flights88.4%
Apr–Jun 202670 flights89.9%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, UA 1877 did best on Thursday at 89.7% on time and worst on Saturday at 74.4%. Each day rests on about 39 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 1877 runs late

One category carries most of the weight here. National Airspace System accounts for 47% of the 2,162 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.

National Airspace System
47%
Carrier
47%
Late-arriving aircraft
6%

47% 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 1,015 minutes out of 2,162, against a national NAS share of 21%. The split is drawn from 2,162 delay minutes reported on UA 1877.

Cancellations are rare at 0.36%, 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

Badly late arrivals are rare here: only 2.9% 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 seven other city pairs in the data, including DEN to EWR (49), DEN to IAD (32) and DEN to BIL (31), 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. 274 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, read UA 1877 as 84.2% on time with 0.36% cancelled over 274 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