Carrier route record

OOGEG→SLC

SkyWest Airlines · Spokane to Salt Lake City

Flights: 739
Period: July 2025 to June 2026
Share of route: 44%
Carriers: 2

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

SkyWest on GEG to SLC earns an A+. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 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 739 flights, with a median arrival 16 minutes early.

Set against the rest of the country, SkyWest's GEG to SLC record is 16 points better than the US average of 77.6%. That gap is worth roughly 161 fewer late arrivals for every thousand flights.

On time

93.7%

Arrivals under 15 minutes late, of 735 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

0.41%

National rate is 1.81%

Whole route

90.6%

Every carrier on GEG to SLC, 1,666 flights

These figures cover 739 flights between July 2025 and June 2026. The median arrival is 16 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 GEG to SLC

SkyWest flew 739 of the 1,666 flights on GEG to SLC, about 44% of it. Its 93.7% on time is 3 points better than the route as a whole, which runs 90.6%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 93.7% to Delta at 88.1%.

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 GEG to SLC
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines (this page)	739	93.7%	72 min	0.41%	A+
Delta Air Lines	927	88.1%	91 min	0.86%	A+

Departure window

When SkyWest runs best on this route

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 739 flights.

5am–8am—
8am–11am336 flights96.1%
11am–2pm25 flights—
2pm–5pm11 flights—
5pm–8pm367 flights91.0%
8pm–5am—

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

The early departures do better, though not dramatically: 96.1% on time for the 8am–11am window against 91.0% for 5pm–8pm. Worth taking if the schedule allows, not worth an extra connection. The 5pm–8pm window is the busiest, with 367 flights scheduled in it.

Across the year

SkyWest on GEG to SLC through the year

Darker means more delays. Figures are on-time percentages.May best, October worst

May is the best month on the calendar at 97.5% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. April was the busiest month here, with 102 flights.

Across the week, Wednesday is the strongest day at 95.4% on time and Friday the weakest at 90.9%. 5 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 59% of the 3,299 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
59%
Extreme weather
38%
National Airspace System
4%

Extreme weather accounts for 38% 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 6.0 times the usual weather exposure. The split is drawn from 3,299 reported delay minutes.

The largest share of delay minutes, 59%, 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 1,933 of the 3,299 delay minutes reported here.

Cancellations are rare at 0.41%, 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 2.6% 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.

The 546 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg runs 92.9% on time across 739 flights, within about 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. 739 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 GEG to SLC

Put together: treat all of this as provisional. 739 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 93.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 735 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