Route reliability record
SLC→IDA
Salt Lake City to Idaho Falls
- Flights
- 1,195
- Period
- September 2025 to August 2026
- Distance
- 189 mi
- Carriers
- 2
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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 1,195 SLC to IDA flights, with a median arrival 9 minutes early.
Best time to fly SLC to IDA: a 8am–11am departure, ideally on a Monday. Flights in that window arrived on time 95.2% of the time and Monday flights 92.0%, against 89.6% for the route overall.
Set against the rest of the country, this route's record is 12 points better than the US average of 77.3%. That gap is worth roughly 123 fewer late arrivals for every thousand flights.
Key figures
On time
89.6%
Arrivals under 15 minutes late, of 1,188 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.42%
National rate is 1.89%
Best carrier
SkyWest
92.5% on time across 878 flights
These figures cover 1,195 flights between September 2025 and August 2026. The median arrival is 9 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 IDA
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 | 878 | 92.5% | 70 min | 0.11% | A+ |
| Delta Air Linesthin sample | 317 | 81.4% | 64 min | 1.26% | B |
Flight by flight
Flights on SLC to IDA
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 19 points, against half a point between the best and worst carrier.
- 5am–8am—
- 8am–11am124 flights95.2%
- 11am–2pm365 flights93.4%
- 2pm–5pm47 flights76.6%
- 5pm–8pm295 flights91.5%
- 8pm–5am364 flights83.8%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 95.2% of the time, against 76.6% for the afternoon window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 365 flights scheduled in it.
Explore
Filter SLC to IDA 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 IDA, the best departure window is 8am–11am at 95.2% on time and the worst is 2pm–5pm at 76.6%, a wide gap of 18.6 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am95.2%
- 11am–2pm93.4%
- 2–5pm76.6%
- 5–8pm91.5%
- 8pm–5am83.8%
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 1,195 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 84.2% on time, against 95.8% in June. 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. August was the busiest month here, with 124 flights.
Across the week, Monday is the strongest day at 92.0% on time and Sunday the weakest at 86.4%, a spread of 6 points.
Delay causes
Why this route gets delayed
Carrier accounts for 56% of the 8,290 delay minutes carriers reported here, and the remaining four split what is left.
- 56%Carrier
- 23%Extreme weather
- 11%National Airspace System
- 10%Late-arriving aircraft
Extreme weather accounts for 23% 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 3.9 times the usual weather exposure. The split is drawn from 8,290 reported delay minutes.
The largest share of delay minutes, 56%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,637 of the 8,290 delay minutes reported here.
Cancellations are rare at 0.42%, 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 4.2% 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 189 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 8am–11am window matters as much as it does.
The return leg runs 91.8% on time across 1,195 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,195 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in IDA after this flight
What to do with this
Booking this route
Put together: take the 8am–11am departure, avoid February if the dates are flexible, and if two carriers are within a few dollars of each other, SkyWest is the one with the record behind it. None of that guarantees an on-time arrival; it moves the odds by 19 points, which is the most any booking decision can do. 1,188 completed flights over 12 months sit behind that.
Common questions
SLC to IDA questions
How often is SLC to IDA delayed?
About one flight in ten arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 10.4% of the 1,195 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is SLC to IDA compared with the rest of the country?
89.6% of flights arrive on time here against a national 77.3%, a difference of 12 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 IDA?
The 8am–11am departure window is the strongest at 95.2% on time. The 2pm–5pm window is the weakest at 76.6%, 19 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 SLC to IDA?
February is the weakest month at 84.2% on time, compared with 95.8% in June. Across the year that is 12 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
- IDA to SLC — the return legseparate record
- Salt Lake City International (SLC) delay statistics
- SkyWest Airlines on SLC to IDA92.5%
- Delta Air Lines on SLC to IDA81.4%
- SLC to DEN, a related route79.0%
- DEN to IDA, a related route82.5%
- SLC to PHX, a related route83.5%
- SkyWest Airlines on-time record92.5%
- Delta Air Lines on-time record81.4%
- The most punctual routes in the US, and the least
- The best time of day to fly, according to 7.05 million flight records
Direction matters. SLC to IDA and IDA 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.