Carrier route record
UAJAC→DEN
United Airlines · Jackson to Denver
- Flights
- 1,161
- Period
- September 2025 to August 2026
- Share of route
- 71%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on JAC to DEN lands a B+, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 1,161 flights, with a median arrival 8 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate United on JAC to DEN from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
76.9%
Arrivals under 15 minutes late, of 1,138 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
0.60%
National rate is 1.89%
Whole route
80.1%
Every carrier on JAC to DEN, 1,631 flights
These figures cover 1,161 flights between September 2025 and August 2026. Beyond the headline rate, 10.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
United against every carrier on JAC to DEN
United flew 1,161 of the 1,631 flights on JAC to DEN, most of the route. Its 76.9% on time is 3 points worse than the route as a whole, which runs 80.1%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 88.0% to United at 76.9%.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 470 | 88.0% | 102 min | 2.77% | A |
| United Airlines (this page) | 1,161 | 76.9% | 89 min | 0.60% | B+ |
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Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against half a point between the best and worst carrier.
- 5am–8am364 flights90.5%
- 8am–11am35 flights88.2%
- 11am–2pm127 flights84.2%
- 2pm–5pm635 flights67.1%
- 5pm–8pm—
- 8pm–5am—
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 90.5% of the time, against 67.1% for the afternoon window. That is 23 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 635 flights scheduled in it.
Across the year
United on JAC to DEN through the year
July is the worst month at 69.3% on time, 21 points below April, the best at 90.0%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 144 flights.
Across the week, Tuesday is the strongest day at 81.9% on time and Monday the weakest at 71.4%, a spread of 11 points.
Arrival by arrival
How late United on JAC to DEN runs when it is late
United on JAC to DEN often beats the schedule: 427 of 1,138 completed flights, 38%, arrived 15 minutes or more early. The 263 late arrivals split 79 under half an hour, 69 between 30 and 60 minutes, and 115 an hour or more.
- 15+ min early427 flights37.5%
- Within 15 min448 flights39.4%
- 15–29 min late79 flights6.9%
- 30–59 min late69 flights6.1%
- 1–2 hours late47 flights4.1%
- 2+ hours late68 flights6.0%
Scale runs 0% to 100%.
Share of 1,138 completed flights by arrival against schedule.
59 of 271 late departures made up the time and arrived on time, 22% of them. 51 flights left on time and still arrived late.
The worst days
Worst days for United on JAC to DEN
The latest arrival of the period was on 26 December 2025, 22 hours 31 minutes behind schedule; most of its delay minutes were filed as extreme weather. Three of the five worst days fell in February 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 26 December 2025 | 22 hours 31 minutes | Extreme weather |
| 11 February 2026 | 7 hours 56 minutes | Late-arriving aircraft |
| 11 February 2026 | 7 hours 39 minutes | Extreme weather |
| 12 February 2026 | 6 hours 50 minutes | Late-arriving aircraft |
| 23 October 2025 | 6 hours 33 minutes | Late-arriving aircraft |
Delay causes
Why United runs late on this route
National Airspace System accounts for 44% of the 24,000 delay minutes carriers reported here, and the remaining four split what is left.
- 44%National Airspace System
- 33%Late-arriving aircraft
- 11%Extreme weather
- 11%Carrier
Extreme weather accounts for 11% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 23,500 reported delay minutes.
44% 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 10,000 minutes out of 24,000, against a national NAS share of 21%.
Cancellations are rare at 0.60%, 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 stage length
What a delay here costs
10.1% 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.
At 406 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg runs 78.6% on time across 1,162 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,161 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking United on JAC to DEN
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 90.0% on time and July 69.3%, a swing of 21 points. If the dates move at all, move them out of July before you think about anything else. 1,138 completed flights over 12 months sit behind that.
Related
Where to go next
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.