Carrier route record
UAJAC→DEN
United Airlines · Jackson to Denver
- Flights
- 1,133
- Period
- July 2025 to June 2026
- Share of route
- 69%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with United Airlines.
United on JAC to DEN sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 1,133 flights, with a median arrival 6 minutes early.
The national on-time rate over the same period is 77.6%, so United on JAC to DEN runs 5 points behind the country as a whole. Across a thousand flights that is about 47 extra late arrivals.
Key figures
On time
72.9%
Arrivals under 15 minutes late, of 1,114 completed flights
Avg delay
91 min
Across delayed arrivals only, not all flights
Cancelled
0.88%
National rate is 1.81%
Whole route
77.1%
Every carrier on JAC to DEN, 1,633 flights
These figures cover 1,133 flights between July 2025 and June 2026. Beyond the headline rate, 11.2% 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.
Carrier by carrier
United against every carrier on JAC to DEN
United flew 1,133 of the 1,633 flights on JAC to DEN, most of the route. Its 72.9% on time is 4 points worse than the route as a whole, which runs 77.1%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 86.9% to United at 72.9%.
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 | 500 | 86.9% | 85 min | 2.60% | A |
| United Airlines (this page) | 1,133 | 72.9% | 91 min | 0.88% | C+ |
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 18 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am364 flights83.7%
- 8am–11am5 flights—
- 11am–2pm127 flights75.2%
- 2pm–5pm637 flights66.1%
- 5pm–8pm—
- 8pm–5am—
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 83.7% of the time, against 66.1% for the afternoon window. That is 18 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 637 flights scheduled in it.
Across the year
United on JAC to DEN through the year
July is the worst month at 44.6% on time, 45 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. June was the busiest month here, with 124 flights.
Across the week, Tuesday is the strongest day at 77.3% on time and Monday the weakest at 68.9%. 8 points is a smaller lever than departure hour, but it is free.
Delay causes
Why United runs late on this route
One category carries most of the weight here. National Airspace System accounts for 44% of the 27,000 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.
- 44%National Airspace System
- 32%Late-arriving aircraft
- 13%Extreme weather
- 11%Carrier
Extreme weather accounts for 13% 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 2.0 times the usual weather exposure. The split is drawn from 27,354 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 12,000 minutes out of 27,000, against a national NAS share of 21%.
Cancellations are rare at 0.88%, 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 stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.2% 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.
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 is a different operation and performs like one: it runs 76.9% on time across 1,134 flights, 4 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.
The sample behind these figures is 1,133 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 44.6%, a swing of 45 points. If the dates move at all, move them out of July before you think about anything else. 1,114 completed flights over 12 months sit behind that.
Related
Where to go next
- JAC to DEN, every carrier
- United on DEN to JAC, the return leg
- SkyWest Airlines on JAC to DEN86.9%
- United Airlines network-wide record
- Denver International (DEN) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
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.