Carrier route record
UADEN→MTJ
United Airlines · Denver to Montrose
- Flights
- 894
- Period
- September 2025 to August 2026
- Share of route
- 63%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on DEN to MTJ sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 894 flights, with a median arrival 1 minute early.
The US average over the same twelve months is 77.3%, so there is little to separate United on DEN to MTJ from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.8%
Arrivals under 15 minutes late, of 892 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
0.11%
National rate is 1.89%
Whole route
75.4%
Every carrier on DEN to MTJ, 1,424 flights
These figures cover 894 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 DEN to MTJ
United flew 894 of the 1,424 flights on DEN to MTJ, most of the route. Its 75.8% on time is about level with the route as a whole at 75.4%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from SkyWest at 87.1% to Southwest at 72.0%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 Airlinesthin sample | 101 | 87.1% | 45 min | 0.00% | A+ |
| United Airlines (this page) | 894 | 75.8% | 68 min | 0.11% | B+ |
| Southwest Airlines | 429 | 72.0% | 61 min | 0.23% | C+ |
Flight by flight
United flight numbers on DEN to MTJ
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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 11 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am—
- 11am–2pm531 flights80.2%
- 2pm–5pm—
- 5pm–8pm363 flights69.4%
- 8pm–5am—
Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 80.2% on time, ahead of 5pm–8pm at 69.4%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 11am–2pm window is the busiest, with 531 flights scheduled in it.
Across the year
United on DEN to MTJ through the year
November is the best month on the calendar at 94.8% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. March was the busiest month here, with 93 flights.
Across the week, Wednesday is the strongest day at 81.2% on time and Friday the weakest at 70.6%, a spread of 11 points.
Arrival by arrival
How late United on DEN to MTJ runs when it is late
The 216 late arrivals split 76 under half an hour, 58 between 30 and 60 minutes, and 82 an hour or more.
- 15+ min early149 flights16.7%
- Within 15 min527 flights59.1%
- 15–29 min late76 flights8.5%
- 30–59 min late58 flights6.5%
- 1–2 hours late41 flights4.6%
- 2+ hours late41 flights4.6%
Scale runs 0% to 100%.
Share of 892 completed flights by arrival against schedule.
27 of 200 late departures made up the time and arrived on time, 14% of them. 43 flights left on time and still arrived late.
The worst days
Worst days for United on DEN to MTJ
The latest arrival of the period was on 19 December 2025, 6 hours 11 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 December 2025 | 6 hours 11 minutes | Carrier |
| 14 August 2026 | 4 hours 49 minutes | Late-arriving aircraft |
| 6 March 2026 | 4 hours 33 minutes | Late-arriving aircraft |
| 21 June 2026 | 4 hours 27 minutes | Carrier |
| 28 January 2026 | 4 hours 16 minutes | Carrier |
Delay causes
Why United runs late on this route
Late-arriving aircraft accounts for 46% of the 15,000 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Late-arriving aircraft
- 34%Carrier
- 20%National Airspace System
- 1%Extreme weather
46% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 15,000 reported delay minutes here, that single category outweighs weather by 42 to one. The split is drawn from 14,575 reported delay minutes.
Cancellations are rare at 0.11%, 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
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 197 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 80.5% on time across 894 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. 894 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 MTJ
Put together: treat all of this as provisional. 894 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 75.8% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 892 completed flights over 12 months sit behind that.
Related
Where to go next
- DEN to MTJ, every carrier
- United on MTJ to DEN, the return leg
- SkyWest Airlines on DEN to MTJ87.1%
- Southwest Airlines on DEN to MTJ72.0%
- United Airlines network-wide record
- Denver International (DEN) delay statistics
- Flying to ski country: which routes into the mountains run on time
- Why the first flight of the morning is statistically safest
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.