Carrier route record

OOSLC→BIL

SkyWest Airlines · Salt Lake City to Billings

Flights: 708
Period: July 2025 to June 2026
Share of route: 66%
Carriers: 2

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

SkyWest on SLC to BIL 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 14 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 708 flights, with a median arrival 9 minutes early.

Set against the rest of the country, SkyWest's SLC to BIL record is 14 points better than the US average of 77.6%. That gap is worth roughly 143 fewer late arrivals for every thousand flights.

On time

91.9%

Arrivals under 15 minutes late, of 704 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

0.56%

National rate is 1.81%

Whole route

88.4%

Every carrier on SLC to BIL, 1,074 flights

These figures cover 708 flights between July 2025 and June 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.

Carrier by carrier

SkyWest against every carrier on SLC to BIL

SkyWest flew 708 of the 1,074 flights on SLC to BIL, most of the route. Its 91.9% on time is 4 points better than the route as a whole, which runs 88.4%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 91.9% to Delta at 81.6%.

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 SLC to BIL
Airline	Flights	On time	Avg delay	Cancelled	Grade
SkyWest Airlines (this page)	708	91.9%	63 min	0.56%	A+
Delta Air Lines	366	81.6%	70 min	0.55%	B+

Flight by flight

SkyWest flight numbers on SLC to BIL

OO 382816:1489.0% · 345 flights

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 708 flights.

5am–8am—
8am–11am363 flights94.7%
11am–2pm2 flights—
2pm–5pm343 flights88.9%
5pm–8pm—
8pm–5am—

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

The early departures do better, though not dramatically: 94.7% on time for the 8am–11am window against 88.9% for 2pm–5pm. Worth taking if the schedule allows, not worth an extra connection. The 8am–11am window is the busiest, with 363 flights scheduled in it.

Across the year

SkyWest on SLC to BIL through the year

Darker means more delays. Figures are on-time percentages.September best, February worst

February is the weak month at 80.0% 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. May was the busiest month here, with 62 flights.

Across the week, Monday is the strongest day at 95.1% on time and Friday the weakest at 88.2%. 7 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 83% of the 3,605 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
83%
Extreme weather
14%
National Airspace System
3%

Extreme weather accounts for 14% 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 2.3 times the usual weather exposure. The split is drawn from 3,605 reported delay minutes.

The largest share of delay minutes, 83%, 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 2,981 of the 3,605 delay minutes reported here.

Cancellations are rare at 0.56%, 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.

At 387 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 90.7% on time across 708 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. 708 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 SLC to BIL

Put together: treat all of this as provisional. 708 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 91.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 704 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