Flight number record

UA 431

United Airlines · Denver to Grand Junction

Route: DEN → GJT
Departs: 19:25
Flights: 283
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 431, check with United Airlines.

UA 431 sits in the middle of the pack with a C+. Close to three flights in four arrive on time by the DOT's definition, 4 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 283 flights, with a median arrival 2 minutes early.

On time

73.9%

Arrivals under 15 minutes late, of 283 completed flights

Avg delay

60 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

9.9%

National rate is 8.1%

These figures cover 283 flights between July 2025 and June 2026. Beyond the headline rate, 9.9% 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 431 flies

UA 431 flies DEN to GJT without a single fixed slot. Its most common scheduled departure was 19:25, used on 101 of 283 flights, with 19:10 (42 flights) and 19:30 (32 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 19:25101 flights35.7%
Departs 19:1042 flights14.8%
Departs 19:3032 flights11.3%

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 19:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and UA 431 runs 6 points better at 73.9%. 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 431 next to DEN to GJT

Every carrier on DEN to GJT combined arrived on time 79.5% of the time across 2,229 flights, so UA 431 is 6 points behind it. United flew 733 flights on the same city pair under all its flight numbers, including this one, and those ran 77.3% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 5 points.

UA 431 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 431thin sample	283	73.9%	60 min	0.00%	C+
All United Airlines on DEN–GJT	733	77.3%	70 min	0.14%	B+
All carriers on DEN–GJT	2,229	79.5%	65 min	1.21%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 431 quarter by quarter

UA 431 did not run the same all year. Its best quarter was Jan–Mar 2026 at 83.9% on time and its weakest Apr–Jun 2026 at 58.1%, a swing of 26 points on roughly 71 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 flights62.8%
Oct–Dec 202591 flights80.2%
Jan–Mar 202687 flights83.9%
Apr–Jun 202662 flights58.1%

Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, UA 431 did best on Wednesday at 80.0% on time and worst on Sunday at 67.5%. Each day rests on about 40 flights, so a gap of 13 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 431 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 66% of the 4,437 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
66%
Carrier
23%
National Airspace System
10%
Extreme weather
1%

66% 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 4,437 reported delay minutes here, that single category outweighs weather by 66 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 4,437 delay minutes reported on UA 431.

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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.9% 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.

The same number turns up on seven other city pairs in the data, including SJC to DEN (103), IAD to DEN (56) and BZN to DEN (35), but none flew often enough under UA 431 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to GJT only.

One caution: this is a thin sample. 283 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 431

For a booking, UA 431 is one of the weaker ways to fly DEN to GJT: 6 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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