Carrier route record
UAIDA→DEN
United Airlines · Idaho Falls to Denver
- Flights
- 246
- Period
- September 2025 to August 2026
- Share of route
- 15%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on IDA to DEN lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That rests on 246 flights, with a median arrival 15 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate United on IDA 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
76.2%
Arrivals under 15 minutes late, of 239 completed flights
Avg delay
110 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
Whole route
81.1%
Every carrier on IDA to DEN, 1,664 flights
These figures cover 246 flights between September 2025 and August 2026. Beyond the headline rate, 9.2% 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 IDA to DEN
United flew 246 of the 1,664 flights on IDA to DEN, about 15% of it. Its 76.2% on time is 5 points worse than the route as a whole, which runs 81.1%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 81.9% to United at 76.2%.
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 | 1,418 | 81.9% | 93 min | 0.42% | B+ |
| United Airlines (this page)thin sample | 246 | 76.2% | 110 min | 0.00% | B+ |
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Departure window
When United runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 246 flights.
There are not enough flights in each departure window to split United's IDA to DEN record by time of day without the percentages moving on noise. The headline rate of 76.2% is the reliable figure here.
Across the year
United on IDA to DEN through the year
- Oct–Dec 202514 flights—
- Jan–Mar 202688 flights81.8%
- Apr–Jun 202682 flights77.8%
- Jul–Sep 202662 flights62.5%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 76.2% on time across 246 flights.
United on IDA to DEN did not run the same all year. Its best quarter was Jan–Mar 2026 at 81.8% on time and its weakest Jul–Sep 2026 at 62.5%, a swing of 19 points on roughly 82 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.
Across the week, Thursday is the strongest day at 86.1% on time and Saturday the weakest at 68.6%, a spread of 18 points.
Arrival by arrival
How late United on IDA to DEN runs when it is late
United on IDA to DEN often beats the schedule: 126 of 239 completed flights, 53%, arrived 15 minutes or more early. The 57 late arrivals split 18 under half an hour, 17 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early126 flights52.7%
- Within 15 min56 flights23.4%
- 15–29 min late18 flights7.5%
- 30–59 min late17 flights7.1%
- 1–2 hours late3 flights1.3%
- 2+ hours late19 flights7.9%
Scale runs 0% to 100%.
Share of 239 completed flights by arrival against schedule.
18 of 67 late departures made up the time and arrived on time, 27% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for United on IDA to DEN
The latest arrival of the period was on 8 June 2026, 19 hours 24 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across June, July, December and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 8 June 2026 | 19 hours 24 minutes | Carrier |
| 26 July 2026 | 8 hours 43 minutes | Late-arriving aircraft |
| 19 December 2025 | 5 hours 7 minutes | Late-arriving aircraft |
| 14 August 2026 | 4 hours 31 minutes | National Airspace System |
| 22 July 2026 | 4 hours 6 minutes | National Airspace System |
Delay causes
Why United runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 6,292 reported delay minutes.
- 36%National Airspace System
- 34%Late-arriving aircraft
- 30%Carrier
- 0%Extreme weather
36% 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 2,251 minutes out of 6,292, against a national NAS share of 21%. The split is drawn from 6,292 reported delay minutes.
Cancellations are rare at 0.00%, below the national 1.89% 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 stage length
What a delay here costs
9.2% 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 458 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 2pm–5pm window matters as much as it does.
The return leg is a different operation and performs like one: it runs 81.6% on time across 246 flights, 5 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 5 points of difference.
One caution: this is a thin sample. 246 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 United on IDA to DEN
Put together: treat all of this as provisional. 246 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 76.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 239 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.