Carrier route record
UAFCA→DEN
United Airlines · Kalispell to Denver
- Flights
- 807
- Period
- September 2025 to August 2026
- Share of route
- 80%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on FCA to DEN lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 807 flights, with a median arrival 10 minutes early.
Set against the rest of the country, United's FCA to DEN record is 6 points better than the US average of 77.3%. That gap is worth roughly 59 fewer late arrivals for every thousand flights.
Key figures
On time
83.2%
Arrivals under 15 minutes late, of 794 completed flights
Avg delay
92 min
Across delayed arrivals only, not all flights
Cancelled
1.24%
National rate is 1.89%
Whole route
84.6%
Every carrier on FCA to DEN, 1,010 flights
These figures cover 807 flights between September 2025 and August 2026. Beyond the headline rate, 8.1% 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 FCA to DEN
United flew 807 of the 1,010 flights on FCA to DEN, most of the route. Its 83.2% on time is about level with the route as a whole at 84.6%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from SkyWest at 89.7% to United at 83.2%. 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 | 203 | 89.7% | 83 min | 0.00% | A+ |
| United Airlines (this page) | 807 | 83.2% | 92 min | 1.24% | 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 30 points, against half a point between the best and worst carrier.
- 5am–8am348 flights93.6%
- 8am–11am—
- 11am–2pm—
- 2pm–5pm352 flights78.8%
- 5pm–8pm107 flights63.5%
- 8pm–5am—
Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 63.5% on time, against 93.6% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 2pm–5pm window is the busiest, with 352 flights scheduled in it.
Across the year
United on FCA to DEN through the year
August is the worst month at 62.2% on time, 34 points below April, the best at 96.6%. 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. August was the busiest month here, with 93 flights.
Across the week, Thursday is the strongest day at 87.6% on time and Monday the weakest at 79.5%, a spread of 8 points.
Arrival by arrival
How late United on FCA to DEN runs when it is late
United on FCA to DEN often beats the schedule: 305 of 794 completed flights, 38%, arrived 15 minutes or more early. The 133 late arrivals split 35 under half an hour, 34 between 30 and 60 minutes, and 64 an hour or more.
- 15+ min early305 flights38.4%
- Within 15 min356 flights44.8%
- 15–29 min late35 flights4.4%
- 30–59 min late34 flights4.3%
- 1–2 hours late37 flights4.7%
- 2+ hours late27 flights3.4%
Scale runs 0% to 100%.
Share of 794 completed flights by arrival against schedule.
32 of 132 late departures made up the time and arrived on time, 24% of them. 33 flights left on time and still arrived late.
The worst days
Worst days for United on FCA to DEN
The latest arrival of the period was on 14 August 2026, 18 hours 24 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 August 2026 | 18 hours 24 minutes | Extreme weather |
| 19 December 2025 | 16 hours 52 minutes | National Airspace System |
| 30 June 2026 | 5 hours 26 minutes | Late-arriving aircraft |
| 8 December 2025 | 4 hours 57 minutes | Late-arriving aircraft |
| 16 March 2026 | 4 hours 15 minutes | Late-arriving aircraft |
Delay causes
Why United runs late on this route
National Airspace System accounts for 46% of the 12,000 delay minutes carriers reported here, and the remaining four split what is left.
- 46%National Airspace System
- 28%Late-arriving aircraft
- 15%Carrier
- 11%Extreme weather
46% 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 5,637 minutes out of 12,000, against a national NAS share of 21%. The split is drawn from 12,195 reported delay minutes.
Cancellations sit at 1.24% against a national 1.89%, which is ordinary. Diversions add another 0.37%.
Connections and stage length
What a delay here costs
8.1% 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 an hour and a half, which a normal layover absorbs.
The 752 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg is a different operation and performs like one: it runs 78.9% on time across 807 flights, 4 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 4 points of difference.
One caution: this is a thin sample. 807 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 FCA to DEN
Put together: treat all of this as provisional. 807 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 83.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 794 completed flights over 12 months sit behind that.
Related
Where to go next
- FCA to DEN, every carrier
- United on DEN to FCA, the return leg
- SkyWest Airlines on FCA to DEN89.7%
- United Airlines network-wide record
- Denver International (DEN) delay statistics
- Flying to ski country: which routes into the mountains run on time
- The best time of day to fly, according to 7.05 million flight records
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.