Route reliability record
TWF→SLC
Twin Falls to Salt Lake City
- Flights
- 859
- Period
- September 2025 to August 2026
- Distance
- 175 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 18 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 859 TWF to SLC flights, with a median arrival 15 minutes early.
Best time to fly TWF to SLC: a 11am–2pm departure, ideally on a Tuesday. Flights in that window arrived on time 96.3% of the time and Tuesday flights 97.2%, against 95.0% for the route overall.
Set against the rest of the country, this route's record is 18 points better than the US average of 77.3%. That gap is worth roughly 177 fewer late arrivals for every thousand flights.
Key figures
On time
95.0%
Arrivals under 15 minutes late, of 855 completed flights
Avg delay
124 min
Across delayed arrivals only, not all flights
Cancelled
0.47%
National rate is 1.89%
Best carrier
SkyWest
95.0% on time across 859 flights
These figures cover 859 flights between September 2025 and August 2026. The median arrival is 15 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 TWF to SLC
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 | 95.0% | 124 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–8am365 flights95.3%
- 8am–11am—
- 11am–2pm189 flights96.3%
- 2pm–5pm304 flights94.0%
- 5pm–8pm1 flights—
- 8pm–5am—
Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.
The 11am–2pm window is the strongest at 96.3% on time. The full set of windows spans 2 points.
Explore
Filter TWF to SLC 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 TWF to SLC, the best departure window is 11am–2pm at 96.3% on time and the worst is 2pm–5pm at 94.0%, a narrow gap of 2.3 points. All US flights leaving 11am–2pm ran 78.3%.
- 5–8am95.3%
- 8–11am—
- 11am–2pm96.3%
- 2–5pm94.0%
- 5–8pm—
- 8pm–5am—
best all US flightsScale 60% to 100%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
Twelve months, one bar each, drawn from the same 859 flights. The strip shows how much of this route's record is set by the calendar rather than by the operation.
February is the weak month at 92.7% 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 97.2% on time and Thursday the weakest at 90.5%, a spread of 7 points.
Delay causes
Why this route gets delayed
Carrier accounts for 83% of the 5,351 delay minutes carriers reported here, and the remaining four split what is left.
- 83%Carrier
- 15%Extreme weather
- 2%National Airspace System
- 0%Security
Extreme weather accounts for 15% 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 2.5 times the usual weather exposure. The split is drawn from 5,351 reported delay minutes.
The largest share of delay minutes, 83%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,435 of the 5,351 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 2.0% 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 11am–2pm window matters as much as it does.
The return leg runs 92.4% 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 SLC 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 95.0% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 855 completed flights over 12 months sit behind that.
Common questions
TWF to SLC questions
How often is TWF to SLC delayed?
About one flight in twenty arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 5.0% of the 859 flights in this analysis, against 22.7% nationally. Delayed flights are late by close to two hours on average.
How reliable is TWF to SLC compared with the rest of the country?
95.0% of flights arrive on time here against a national 77.3%, a difference of 18 points in its favour. That is worth a A+ on this site's grading scale.
What time of day has the fewest delays on TWF to SLC?
The 11am–2pm departure window is the strongest at 96.3% on time. The 2pm–5pm window is the weakest at 94.0%, 2 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 February delays on TWF to SLC?
February is the weakest month at 92.7% on time, compared with 100.0% in September. Across the year that is 7 points between the best and worst months. The seasonal swing is modest enough that it should not decide when you travel.
Related
Where to go next
- SLC to TWF — the return legseparate record
- Salt Lake City International (SLC) delay statistics
- DEN to SLC, a related route78.2%
- PHX to SLC, a related route83.0%
- LAX to SLC, a related route87.2%
- SkyWest Airlines on-time record95.0%
- The most punctual routes in the US, and the least
- Does flight distance affect delays? Less than it affects cancellations
Direction matters. TWF to SLC and SLC to TWF 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.