Route reliability record
SLC→TWF
Salt Lake City to Twin Falls
- Flights
- 859
- Period
- September 2025 to August 2026
- Distance
- 175 mi
- Carriers
- 1
This route earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 859 SLC to TWF flights, with a median arrival 12 minutes early.
Best time to fly SLC to TWF: a 8pm–5am departure, ideally on a Tuesday. Flights in that window arrived on time 93.3% of the time and Tuesday flights 95.5%, against 92.4% for the route overall.
Set against the rest of the country, this route's record is 15 points better than the US average of 77.3%. That gap is worth roughly 151 fewer late arrivals for every thousand flights.
Key figures
On time
92.4%
Arrivals under 15 minutes late, of 854 completed flights
Avg delay
85 min
Across delayed arrivals only, not all flights
Cancelled
0.47%
National rate is 1.89%
Best carrier
SkyWest
92.4% on time across 859 flights
These figures cover 859 flights between September 2025 and August 2026. The median arrival is 12 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 SLC to TWF
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 | 859 | 92.4% | 85 min | 0.47% | A+ |
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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 859 flights.
- 5am–8am—
- 8am–11am154 flights92.9%
- 11am–2pm286 flights91.6%
- 2pm–5pm55 flights90.6%
- 5pm–8pm20 flights—
- 8pm–5am344 flights93.3%
Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.
The overnight block holds up unusually well at 93.3% on time across 344 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 8pm–5am window is the busiest, with 344 flights scheduled in it.
Explore
Filter SLC to TWF 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 SLC to TWF, the best departure window is 8pm–5am at 93.3% on time and the worst is 2pm–5pm at 90.6%, a narrow gap of 2.7 points. All US flights leaving 8pm–5am ran 70.1%.
- 5–8am—
- 8–11am92.9%
- 11am–2pm91.6%
- 2–5pm90.6%
- 5–8pm—
- 8pm–5am93.3%
best all US flightsScale 60% to 100%. Cells under 30 flights show a dash.
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.
January is the weak month at 86.2% on time, against 100.0% in September. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. March was the busiest month here, with 86 flights.
Across the week, Tuesday is the strongest day at 95.5% on time and Sunday the weakest at 89.8%, a spread of 6 points.
Delay causes
Why this route gets delayed
Carrier accounts for 69% of the 5,497 delay minutes carriers reported here, and the remaining four split what is left.
- 69%Carrier
- 27%Extreme weather
- 4%National Airspace System
Extreme weather accounts for 27% 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 4.5 times the usual weather exposure. The split is drawn from 5,497 reported delay minutes.
The largest share of delay minutes, 69%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,820 of the 5,497 delay minutes reported here.
Cancellations are rare at 0.47%, 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
Badly late arrivals are rare here: only 2.6% land an hour or more behind schedule, against 8.3% 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 175 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 95.0% on time across 859 flights, within 3 points 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. 859 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 TWF after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 859 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 92.4% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 854 completed flights over 12 months sit behind that.
Common questions
SLC to TWF questions
How often is SLC to TWF delayed?
Roughly one flight in twelve arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 7.6% of the 859 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
How reliable is SLC to TWF compared with the rest of the country?
92.4% of flights arrive on time here against a national 77.3%, a difference of 15 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 TWF?
The 8pm–5am departure window is the strongest at 93.3% on time. The 2pm–5pm window is the weakest at 90.6%, 3 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 January delays on SLC to TWF?
January is the weakest month at 86.2% on time, compared with 100.0% in September. 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
- TWF to SLC — the return legseparate record
- Salt Lake City International (SLC) delay statistics
- SLC to DEN, a related route79.0%
- SLC to PHX, a related route83.5%
- SLC to LAX, a related route85.6%
- SkyWest Airlines on-time record92.4%
- The most punctual routes in the US, and the least
- Worst months to fly in the US, ranked by the data
Direction matters. SLC to TWF and TWF 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.