Carrier route record

OOIDA→SLC

SkyWest Airlines · Idaho Falls to Salt Lake City

Flights: 872
Period: July 2025 to June 2026
Share of route: 73%
Carriers: 2

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with SkyWest Airlines.

SkyWest on IDA to SLC 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 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 872 flights, with a median arrival 11 minutes early.

Set against the rest of the country, SkyWest's IDA to SLC record is 15 points better than the US average of 77.6%. That gap is worth roughly 153 fewer late arrivals for every thousand flights.

On time

92.9%

Arrivals under 15 minutes late, of 871 completed flights

Avg delay

69 min

Across delayed arrivals only, not all flights

Cancelled

0.11%

National rate is 1.81%

Whole route

91.6%

Every carrier on IDA to SLC, 1,189 flights

These figures cover 872 flights between July 2025 and June 2026. The median arrival is 11 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

SkyWest against every carrier on IDA to SLC

SkyWest flew 872 of the 1,189 flights on IDA to SLC, most of the route. Its 92.9% on time is about level with the route as a whole at 91.6%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 92.9% to Delta at 88.2%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

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.

On-time performance by carrier on IDA to SLC
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines (this page)	872	92.9%	69 min	0.11%	A+
Delta Air Linesthin sample	317	88.2%	167 min	0.95%	A+

Flight by flight

SkyWest flight numbers on IDA to SLC

OO 389518:5289.7% · 340 flights

Departure window

When SkyWest runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 10 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am48 flights100.0%
8am–11am2 flights—
11am–2pm360 flights94.4%
2pm–5pm122 flights94.3%
5pm–8pm340 flights89.7%
8pm–5am—

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 100.0% of the time, against 89.7% for the evening window. That is 10 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 360 flights scheduled in it.

Across the year

SkyWest on IDA to SLC through the year

Darker means more delays. Figures are on-time percentages.November best, January worst

January is the weak month at 86.5% on time, against 100.0% in November. 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 91 flights.

Across the week, Friday is the strongest day at 96.1% on time and Sunday the weakest at 87.2%. 9 points is a smaller lever than departure hour, but it is free.

Delay causes

Why SkyWest runs late on this route

One category carries most of the weight here. Carrier accounts for 63% of the 4,276 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.

Carrier
63%
Extreme weather
28%
National Airspace System
9%

Extreme weather accounts for 28% 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 4.6 times the usual weather exposure. The split is drawn from 4,276 reported delay minutes.

The largest share of delay minutes, 63%, 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 2,689 of the 4,276 delay minutes reported here.

Cancellations are rare at 0.11%, 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 costs

Badly late arrivals are rare here: only 3.2% 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 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 5am–8am window matters as much as it does.

The return leg runs 93.3% on time across 872 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. 872 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.

What to do with this

Booking SkyWest on IDA to SLC

Put together: treat all of this as provisional. 872 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 92.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 871 completed flights over 12 months sit behind that.

Where to go next

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.

Key figures