Carrier route record
UADEN→IDA
United Airlines · Denver to Idaho Falls
- 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 DEN to IDA lands a B+, 4 points better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 246 flights, with a median arrival 7 minutes early.
Set against the rest of the country, United's DEN to IDA record is 4 points better than the US average of 77.3%. That gap is worth roughly 43 fewer late arrivals for every thousand flights.
Key figures
On time
81.6%
Arrivals under 15 minutes late, of 245 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
Whole route
82.5%
Every carrier on DEN to IDA, 1,663 flights
These figures cover 246 flights between September 2025 and August 2026. The median arrival is 7 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
United against every carrier on DEN to IDA
United flew 246 of the 1,663 flights on DEN to IDA, about 15% of it. Its 81.6% on time is about level with the route as a whole at 82.5%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 82.6% to United at 81.6%.
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 | 1,417 | 82.6% | 73 min | 0.35% | B+ |
| United Airlines (this page)thin sample | 246 | 81.6% | 64 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 DEN to IDA record by time of day without the percentages moving on noise. The headline rate of 81.6% is the reliable figure here.
Across the year
United on DEN to IDA through the year
- Oct–Dec 202514 flights—
- Jan–Mar 202688 flights88.5%
- Apr–Jun 202682 flights72.0%
- Jul–Sep 202662 flights87.1%
Scale runs 65% to 95%. 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 81.6% on time across 246 flights.
United on DEN to IDA did not run the same all year. Its best quarter was Jan–Mar 2026 at 88.5% on time and its weakest Apr–Jun 2026 at 72.0%, a swing of 17 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, Monday is the strongest day at 89.2% on time and Friday the weakest at 75.7%, a spread of 14 points.
Arrival by arrival
How late United on DEN to IDA runs when it is late
The 45 late arrivals split 7 under half an hour, 24 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early50 flights20.4%
- Within 15 min150 flights61.2%
- 15–29 min late7 flights2.9%
- 30–59 min late24 flights9.8%
- 1–2 hours late10 flights4.1%
- 2+ hours late4 flights1.6%
Scale runs 0% to 100%.
Share of 245 completed flights by arrival against schedule.
8 of 48 late departures made up the time and arrived on time, 17% of them. 5 flights left on time and still arrived late.
The worst days
Worst days for United on DEN to IDA
The latest arrival of the period was on 19 December 2025, 5 hours 10 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 December 2025 | 5 hours 10 minutes | Late-arriving aircraft |
| 28 June 2026 | 3 hours 41 minutes | Late-arriving aircraft |
| 14 July 2026 | 3 hours 10 minutes | Late-arriving aircraft |
| 6 March 2026 | 2 hours 16 minutes | National Airspace System |
| 11 August 2026 | 1 hour 54 minutes | Late-arriving aircraft |
Delay causes
Why United runs late on this route
Late-arriving aircraft accounts for 72% of the 2,883 delay minutes carriers reported here, and the remaining four split what is left.
- 72%Late-arriving aircraft
- 17%Carrier
- 11%National Airspace System
72% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,883 reported delay minutes here, that single category outweighs weather by 72 to one. The split is drawn from 2,883 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
5.7% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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 11am–2pm window matters as much as it does.
The return leg is a different operation and performs like one: it runs 76.2% on time across 246 flights, 5 points below 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 DEN to IDA
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 81.6% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 245 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.