Route reliability record
DEN→SGU
Denver to St. George
- Flights
- 1,072
- Period
- September 2025 to August 2026
- Distance
- 517 mi
- Carriers
- 1
This route lands a B+, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 1,072 DEN to SGU flights, with a median arrival 7 minutes early.
Best time to fly DEN to SGU: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 88.2% of the time and Wednesday flights 85.0%, against 80.0% for the route overall.
The US average over the same twelve months is 77.3%, 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
80.0%
Arrivals under 15 minutes late, of 1,061 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.89%
Best carrier
SkyWest
80.0% on time across 1,072 flights
These figures cover 1,072 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
Which airline is most reliable on DEN to SGU
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 | 1,072 | 80.0% | 78 min | 0.56% | B+ |
Flight by flight
Flights on DEN to SGU
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.
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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 13 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am358 flights88.2%
- 11am–2pm358 flights75.2%
- 2pm–5pm62 flights75.4%
- 5pm–8pm—
- 8pm–5am294 flights76.9%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 75.2% on time against 88.2% for 8am–11am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8am–11am window is the busiest, with 358 flights scheduled in it.
Explore
Filter DEN to SGU by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On DEN to SGU, the best departure window is 8am–11am at 88.2% on time and the worst is 11am–2pm at 75.2%, a wide gap of 13.0 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am88.2%
- 11am–2pm75.2%
- 2–5pm75.4%
- 5–8pm—
- 8pm–5am76.9%
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 33 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 62.9% on time, 33 points below November, the best at 95.5%. 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. March was the busiest month here, with 93 flights.
Across the week, Wednesday is the strongest day at 85.0% on time and Monday the weakest at 74.1%, a spread of 11 points.
Delay causes
Why this route gets delayed
Carrier accounts for 50% of the 16,000 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Carrier
- 24%Late-arriving aircraft
- 17%National Airspace System
- 8%Extreme weather
The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 8,298 of the 16,000 delay minutes reported here. The split is drawn from 16,452 reported delay minutes.
Cancellations are rare at 0.56%, 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 actually costs
6.9% 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 a little over an hour, which a normal layover absorbs.
The 517 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 runs 79.5% on time across 1,072 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. 1,072 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 SGU after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 1,072 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 80.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,061 completed flights over 12 months sit behind that.
Common questions
DEN to SGU questions
How often is DEN to SGU 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 20.0% of the 1,072 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
How reliable is DEN to SGU compared with the rest of the country?
80.0% of flights arrive on time here against a national 77.3%, a difference of 3 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 SGU?
The 8am–11am departure window is the strongest at 88.2% on time. The 11am–2pm window is the weakest at 75.2%, 13 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 SGU?
June is the weakest month at 62.9% on time, compared with 95.5% in November. Across the year that is 33 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
- SGU to DEN — the return legseparate record
- Denver International (DEN) delay statistics
- DEN to PHX, a related route75.6%
- SLC to SGU, a related route91.4%
- DEN to SLC, a related route78.2%
- SkyWest Airlines on-time record80.0%
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. DEN to SGU and SGU 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.