Route reliability record
SGU→DEN
St. George to Denver
- Flights
- 1,072
- Period
- September 2025 to August 2026
- Distance
- 517 mi
- Carriers
- 1
This route lands a B+, 2 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 close to two hours on average. That rests on 1,072 SGU to DEN flights, with a median arrival 8 minutes early.
Best time to fly SGU to DEN: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 89.8% of the time and Saturday flights 88.1%, against 79.5% 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
79.5%
Arrivals under 15 minutes late, of 1,056 completed flights
Avg delay
102 min
Across delayed arrivals only, not all flights
Cancelled
0.19%
National rate is 1.89%
Best carrier
SkyWest
79.5% on time across 1,072 flights
These figures cover 1,072 flights between September 2025 and August 2026. Beyond the headline rate, 8.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on SGU to DEN
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 | 79.5% | 102 min | 0.19% | B+ |
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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 26 points, against half a point between the best and worst carrier.
- 5am–8am357 flights89.8%
- 8am–11am31 flights80.6%
- 11am–2pm261 flights76.1%
- 2pm–5pm119 flights63.5%
- 5pm–8pm304 flights76.5%
- 8pm–5am—
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.8% of the time, against 63.5% for the afternoon window. That is 26 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 357 flights scheduled in it.
Explore
Filter SGU to DEN 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 SGU to DEN, the best departure window is 5am–8am at 89.8% on time and the worst is 2pm–5pm at 63.5%, a wide gap of 26.3 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am89.8%
- 8–11am80.6%
- 11am–2pm76.1%
- 2–5pm63.5%
- 5–8pm76.5%
- 8pm–5am—
best all US flightsScale 55% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 28 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.
November is the best month on the calendar at 93.1% 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, Saturday is the strongest day at 88.1% on time and Monday the weakest at 75.5%, a spread of 13 points.
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 22,000 reported delay minutes.
- 40%Carrier
- 35%Late-arriving aircraft
- 22%National Airspace System
- 3%Extreme weather
35% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 22,000 reported delay minutes here, that single category outweighs weather by 11 to one. The split is drawn from 22,123 reported delay minutes.
The largest share of delay minutes, 40%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 8,747 of the 22,000 delay minutes reported here.
Cancellations are rare at 0.19%, 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
8.7% 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 close to two hours, 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 80.0% 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 DEN 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 79.5% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,056 completed flights over 12 months sit behind that.
Common questions
SGU to DEN questions
How often is SGU to DEN 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 20.5% of the 1,072 flights in this analysis, against 22.7% nationally. Delayed flights are late by close to two hours on average.
How reliable is SGU to DEN compared with the rest of the country?
79.5% of flights arrive on time here against a national 77.3%, a difference of 2 points in its favour. That is worth a B+ on this site's grading scale.
What time of day has the fewest delays on SGU to DEN?
The 5am–8am departure window is the strongest at 89.8% on time. The 2pm–5pm window is the weakest at 63.5%, 26 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 May delays on SGU to DEN?
May is the weakest month at 65.2% on time, compared with 93.1% in November. Across the year that is 28 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
- DEN to SGU — the return legseparate record
- Denver International (DEN) delay statistics
- SGU to SLC, a related route93.0%
- PHX to DEN, a related route76.7%
- SGU to PHX, a related route82.5%
- SkyWest Airlines on-time record79.5%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. SGU to DEN and DEN to SGU 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.