Carrier route record
OOSLC→BIL
SkyWest Airlines · Salt Lake City to Billings
- Flights
- 709
- Period
- September 2025 to August 2026
- Share of route
- 66%
- Carriers
- 2
Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 709 flights, with a median arrival 10 minutes early.
Set against the rest of the country, SkyWest's SLC to BIL record is 14 points better than the US average of 77.3%. That gap is worth roughly 138 fewer late arrivals for every thousand flights.
Key figures
On time
91.1%
Arrivals under 15 minutes late, of 704 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.56%
National rate is 1.89%
Whole route
87.2%
Every carrier on SLC to BIL, 1,074 flights
These figures cover 709 flights between September 2025 and August 2026. The median arrival is 10 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
SkyWest against every carrier on SLC to BIL
SkyWest flew 709 of the 1,074 flights on SLC to BIL, most of the route. Its 91.1% on time is 4 points better than the route as a whole, which runs 87.2%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from SkyWest at 91.1% to Delta at 79.7%.
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 (this page) | 709 | 91.1% | 70 min | 0.56% | A+ |
| Delta Air Lines | 365 | 79.7% | 58 min | 0.27% | B+ |
Flight by flight
SkyWest flight numbers on SLC to BIL
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 709 flights.
- 5am–8am—
- 8am–11am363 flights94.7%
- 11am–2pm2 flights—
- 2pm–5pm344 flights87.1%
- 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 87.1% 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
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 95.2% on time and Friday the weakest at 84.5%, a spread of 11 points.
Arrival by arrival
How late SkyWest on SLC to BIL runs when it is late
SkyWest on SLC to BIL often beats the schedule: 217 of 704 completed flights, 31%, arrived 15 minutes or more early. The 63 late arrivals split 27 under half an hour, 14 between 30 and 60 minutes, and 22 an hour or more.
- 15+ min early217 flights30.8%
- Within 15 min424 flights60.2%
- 15–29 min late27 flights3.8%
- 30–59 min late14 flights2.0%
- 1–2 hours late11 flights1.6%
- 2+ hours late11 flights1.6%
Scale runs 0% to 100%.
Share of 704 completed flights by arrival against schedule.
10 of 58 late departures made up the time and arrived on time, 17% of them. 15 flights left on time and still arrived late.
The worst days
Worst days for SkyWest on SLC to BIL
The latest arrival of the period was on 29 August 2026, 5 hours 38 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 August 2026 | 5 hours 38 minutes | Extreme weather |
| 26 March 2026 | 4 hours 40 minutes | Extreme weather |
| 20 February 2026 | 4 hours 32 minutes | Carrier |
| 19 March 2026 | 4 hours 20 minutes | Carrier |
| 5 February 2026 | 3 hours 30 minutes | Carrier |
Delay causes
Why SkyWest runs late on this route
Carrier accounts for 77% of the 4,396 delay minutes carriers reported here, and the remaining four split what is left.
- 77%Carrier
- 19%Extreme weather
- 4%National Airspace System
Extreme weather accounts for 19% 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 3.2 times the usual weather exposure. The split is drawn from 4,396 reported delay minutes.
The largest share of delay minutes, 77%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,377 of the 4,396 delay minutes reported here.
Cancellations are rare at 0.56%, 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 costs
Badly late arrivals are rare here: only 3.1% 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 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 89.9% on time across 709 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. 709 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. 709 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 91.1% 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.
Related
Where to go next
- SLC to BIL, every carrier
- SkyWest on BIL to SLC, the return leg
- Delta Air Lines on SLC to BIL79.7%
- SkyWest Airlines network-wide record
- Salt Lake City International (SLC) delay statistics
- Worst months to fly in the US, ranked by the data
- Late aircraft, weather, or the airline: what actually causes US flight delays
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.