Route reliability record
SLC→SUN
Salt Lake City to Hailey
- Flights
- 1,078
- Period
- July 2025 to June 2026
- Distance
- 222 mi
- Carriers
- 1
This route earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.6%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 1,078 SLC to SUN flights, with a median arrival 13 minutes early.
Best time to fly SLC to SUN: a 8pm–5am departure, ideally on a Tuesday. Flights in that window arrived on time 97.2% of the time and Tuesday flights 97.4%, against 94.2% for the route overall.
Set against the rest of the country, this route's record is 17 points better than the US average of 77.6%. That gap is worth roughly 166 fewer late arrivals for every thousand flights.
Key figures
On time
94.2%
Arrivals under 15 minutes late, of 1,060 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
0.74%
National rate is 1.81%
Best carrier
SkyWest
94.2% on time across 1,078 flights
These figures cover 1,078 flights between July 2025 and June 2026. The median arrival is 13 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 SLC to SUN
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 | 1,078 | 94.2% | 54 min | 0.74% | A+ |
Flight by flight
Flights on SLC to SUN
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.
Departure window
The best time of day to leave
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 1,078 flights.
- 5am–8am—
- 8am–11am226 flights92.4%
- 11am–2pm477 flights92.5%
- 2pm–5pm13 flights—
- 5pm–8pm—
- 8pm–5am362 flights97.2%
Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.
The overnight block holds up unusually well at 97.2% on time across 362 flights. Red-eyes fly into empty airspace and empty gates, and they are the first rotation of the aircraft's day rather than the last. The 11am–2pm window is the busiest, with 477 flights scheduled in it.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 1,078 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
Delays peak in April, when the on-time rate falls to 86.4%. July is the strongest month at 97.8%. Moving a flexible trip across that boundary buys 11 points. March was the busiest month here, with 93 flights.
Across the week, Tuesday is the strongest day at 97.4% on time and Saturday the weakest at 90.3%. 7 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Carrier accounts for 72% of the 3,329 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 72%Carrier
- 21%Extreme weather
- 7%National Airspace System
Extreme weather accounts for 21% 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 3.4 times the usual weather exposure. The split is drawn from 3,329 reported delay minutes.
The largest share of delay minutes, 72%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,390 of the 3,329 delay minutes reported here.
Cancellations are rare at 0.74%, 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
Badly late arrivals are rare here: only 1.7% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 222 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 8pm–5am window matters as much as it does.
The return leg runs 94.6% on time across 1,078 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. 1,078 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 SUN after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 1,078 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 94.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,060 completed flights over 12 months sit behind that.
Common questions
SLC to SUN questions
How often is SLC to SUN delayed?
Roughly one flight in fifteen arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 5.8% of the 1,078 flights in this analysis, against 22.4% nationally. Delayed flights are late by roughly 55 minutes on average.
How reliable is SLC to SUN compared with the rest of the country?
94.2% of flights arrive on time here against a national 77.6%, a difference of 17 points in its favour. That is worth a A+ on this site's grading scale.
What time of day has the fewest delays on SLC to SUN?
The 8pm–5am departure window is the strongest at 97.2% on time. The 8am–11am window is the weakest at 92.4%, 5 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 April delays on SLC to SUN?
April is the weakest month at 86.4% on time, compared with 97.8% in July. Across the year that is 11 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
- SUN to SLC — the return legseparate record
- Salt Lake City International (SLC) delay statistics
- SLC to DEN, a related route77.8%
- SLC to PHX, a related route83.9%
- SLC to LAX, a related route86.2%
- SkyWest Airlines on-time record94.2%
- Worst months to fly in the US, ranked by the data
- Late aircraft, weather, or the airline: what actually causes US flight delays
Direction matters. SLC to SUN and SUN to SLC 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.