Flight number record
UA 431
United Airlines · Denver to Grand Junction
- Route
- DEN → GJT
- Departs
- 19:25
- Flights
- 331
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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+. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 331 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so UA 431 runs 8 points behind the country as a whole. Across a thousand flights that is about 82 extra late arrivals.
Key figures
On time
69.1%
Arrivals under 15 minutes late, of 330 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
0.30%
National rate is 1.89%
1 hour+ late
12.1%
National rate is 8.3%
These figures cover 331 flights between September 2025 and August 2026. Beyond the headline rate, 12.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 160 of 331 flights.
- Departs 19:25160 flights48.3%
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 19:25 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and UA 431 runs level with that at 69.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 431 next to DEN to GJT
Every carrier on DEN to GJT combined arrived on time 79.9% of the time across 2,282 flights, so UA 431 is 11 points behind it. United flew 732 flights on the same city pair under all its flight numbers, including this one, and those ran 77.8% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 431thin sample | 331 | 69.1% | 68 min | 0.30% | C+ |
| All United Airlines on DEN–GJT | 732 | 77.8% | 63 min | 0.14% | B+ |
| All carriers on DEN–GJT | 2,282 | 79.9% | 67 min | 1.31% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | 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 Jul–Sep 2026 at 41.7%, a swing of 42 points on roughly 66 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 flights70.0%
- Oct–Dec 202591 flights80.2%
- Jan–Mar 202687 flights83.9%
- Apr–Jun 202662 flights58.1%
- Jul–Sep 202661 flights41.7%
Scale runs 35% to 90%.
By weekday, UA 431 did best on Thursday at 76.6% on time and worst on Sunday at 61.7%. Each day rests on about 47 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 431 runs when it is late
The 102 late arrivals split 29 under half an hour, 33 between 30 and 60 minutes, and 40 an hour or more.
- 15+ min early39 flights11.8%
- Within 15 min189 flights57.3%
- 15–29 min late29 flights8.8%
- 30–59 min late33 flights10.0%
- 1–2 hours late25 flights7.6%
- 2+ hours late15 flights4.5%
Scale runs 0% to 100%.
Share of 330 completed flights by arrival against schedule.
15 of 101 late departures made up the time and arrived on time, 15% of them. 16 flights left on time and still arrived late.
The worst days
Worst days for UA 431
The latest arrival of the period was on 21 August 2026, 5 hours 39 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 21 August 2026 | 5 hours 39 minutes | Late-arriving aircraft |
| 23 August 2026 | 3 hours 52 minutes | Late-arriving aircraft |
| 26 July 2026 | 3 hours 46 minutes | Late-arriving aircraft |
| 17 June 2026 | 3 hours 43 minutes | Late-arriving aircraft |
| 17 February 2026 | 3 hours 31 minutes | Late-arriving aircraft |
Delay causes
Why UA 431 runs late
Late-arriving aircraft accounts for 71% of the 6,917 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Late-arriving aircraft
- 20%Carrier
- 9%National Airspace System
- 0%Extreme weather
71% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,917 reported delay minutes here, that single category outweighs weather by 71 to one. The split is drawn from 6,917 delay minutes reported on UA 431.
Cancellations are rare at 0.30%, 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
12.1% 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.
The same number turns up on five other city pairs in the data, including SJC to DEN (91), IAD to DEN (56) and BZN to DEN (56), 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. 331 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 a flight to put a long connection behind. 12.1% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
Related
Where to go next
- DEN to GJT, every carrier and departure
- GJT to DEN, the return direction
- SkyWest Airlines 4770 on the same route69.7%
- SkyWest Airlines 5488 on the same route86.1%
- United Airlines 1714 on the same route86.6%
- SkyWest Airlines 4704 on the same route87.6%
- SkyWest Airlines 5240 on the same route78.0%
- 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
- 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.