Route reliability record
DEN→GUC
Denver to Gunnison
- Flights
- 995
- Period
- July 2025 to June 2026
- Distance
- 152 mi
- Carriers
- 1
This route lands a B+, 4 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 995 DEN to GUC flights, with a median arrival 6 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
81.3%
Arrivals under 15 minutes late, of 983 completed flights
Avg delay
95 min
Across delayed arrivals only, not all flights
Cancelled
0.80%
National rate is 1.81%
Best carrier
SkyWest
81.3% on time across 995 flights
These figures cover 995 flights between July 2025 and June 2026. The median arrival is 6 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.
Carrier by carrier
Which airline is most reliable on DEN to GUC
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 | 995 | 81.3% | 95 min | 0.80% | B+ |
Flight by flight
Flights on DEN to GUC
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Best ways to make this trip
The most reliable ways to fly Denver to Gunnison
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 3 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. DEN → GUCDenver to Gunnison | SkyWest Airlines | 80.6% | 81.3% | 0.80% | 11am–2pm, Tue | OO 5343 11:30 |
| 2. DEN → MTJDenver to Montrose | United Airlines | 74.5% | 74.6% | 0.11% | 11am–2pm, Wed | — |
| 3. DEN → MTJDenver to Montrose | Southwest Airlines | 73.9% | 73.9% | 0.00% | 8am–11am, Wed | — |
| 4. DEN → ASEDenver to Aspen | SkyWest Airlines | 70.9% | 74.8% | 5.23% | 5am–8am, Wed | OO 5782 09:50 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
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. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am—
- 8am–11am—
- 11am–2pm631 flights85.3%
- 2pm–5pm—
- 5pm–8pm364 flights74.3%
- 8pm–5am—
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 85.3% on time, ahead of 5pm–8pm at 74.3%. 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 631 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 14 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
June is the worst month at 74.4% on time, 14 points below March, the best at 88.6%. 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. January was the busiest month here, with 93 flights.
Across the week, Tuesday is the strongest day at 85.4% on time and Thursday the weakest at 78.6%. 7 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
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 17,000 reported delay minutes.
- 32%Late-arriving aircraft
- 29%Carrier
- 21%National Airspace System
- 18%Extreme weather
Extreme weather accounts for 18% 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 2.9 times the usual weather exposure. The split is drawn from 17,465 reported delay minutes.
Cancellations are rare at 0.80%, 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 actually costs
7.6% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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.
At 152 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 runs 80.6% on time across 995 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 995 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.
Work out the risk of missing a connection in GUC after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 995 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 81.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 983 completed flights over 12 months sit behind that.
Common questions
DEN to GUC questions
How often is DEN to GUC delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 18.7% of the 995 flights in this analysis, against 22.4% nationally. Delayed flights are late by an hour and a half on average.
How reliable is DEN to GUC compared with the rest of the country?
81.3% of flights arrive on time here against a national 77.6%, a difference of 4 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on DEN to GUC?
The 11am–2pm departure window is the strongest at 85.3% on time. The 5pm–8pm window is the weakest at 74.3%, 11 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are June delays on DEN to GUC?
June is the weakest month at 74.4% on time, compared with 88.6% in March. Across the year that is 14 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- GUC to DEN — the return legseparate record
- Denver International (DEN) delay statistics
- DEN to PHX, a related route75.7%
- DEN to SLC, a related route77.5%
- DEN to LAX, a related route79.0%
- SkyWest Airlines on-time record81.3%
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. DEN to GUC and GUC to DEN are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.