Carrier route record
OOBIL→SLC
SkyWest Airlines · Billings to Salt Lake City
- 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 BIL 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 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 709 flights, with a median arrival 11 minutes early.
Set against the rest of the country, SkyWest's BIL to SLC record is 13 points better than the US average of 77.3%. That gap is worth roughly 126 fewer late arrivals for every thousand flights.
Key figures
On time
89.9%
Arrivals under 15 minutes late, of 701 completed flights
Avg delay
84 min
Across delayed arrivals only, not all flights
Cancelled
0.71%
National rate is 1.89%
Whole route
91.3%
Every carrier on BIL to SLC, 1,074 flights
These figures cover 709 flights between September 2025 and August 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.
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Carrier by carrier
SkyWest against every carrier on BIL to SLC
SkyWest flew 709 of the 1,074 flights on BIL to SLC, most of the route. Its 89.9% on time is about level with the route as a whole at 91.3%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Delta at 94.0% to SkyWest at 89.9%.
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 |
|---|---|---|---|---|---|
| Delta Air Lines | 365 | 94.0% | 98 min | 0.27% | A+ |
| SkyWest Airlines (this page) | 709 | 89.9% | 84 min | 0.71% | A+ |
Flight by flight
SkyWest flight numbers on BIL to SLC
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–11am4 flights—
- 11am–2pm359 flights94.4%
- 2pm–5pm2 flights—
- 5pm–8pm344 flights85.0%
- 8pm–5am—
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 94.4% on time, ahead of 5pm–8pm at 85.0%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 11am–2pm window is the busiest, with 359 flights scheduled in it.
Across the year
SkyWest on BIL to SLC through the year
February is the weak month at 80.0% on time, against 96.7% 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 94.2% on time and Friday the weakest at 85.4%, a spread of 9 points.
Arrival by arrival
How late SkyWest on BIL to SLC runs when it is late
SkyWest on BIL to SLC often beats the schedule: 259 of 701 completed flights, 37%, arrived 15 minutes or more early. The 71 late arrivals split 23 under half an hour, 19 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early259 flights36.9%
- Within 15 min371 flights52.9%
- 15–29 min late23 flights3.3%
- 30–59 min late19 flights2.7%
- 1–2 hours late16 flights2.3%
- 2+ hours late13 flights1.9%
Scale runs 0% to 100%.
Share of 701 completed flights by arrival against schedule.
12 of 69 late departures made up the time and arrived on time, 17% of them. Only 14 left on time and still arrived late.
The worst days
Worst days for SkyWest on BIL to SLC
The latest arrival of the period was on 20 April 2026, 12 hours 33 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 April 2026 | 12 hours 33 minutes | Carrier |
| 29 August 2026 | 5 hours 37 minutes | Extreme weather |
| 4 October 2025 | 4 hours 19 minutes | Carrier |
| 26 March 2026 | 4 hours 14 minutes | Carrier |
| 20 February 2026 | 3 hours 48 minutes | Carrier |
Delay causes
Why SkyWest runs late on this route
Carrier accounts for 74% of the 5,987 delay minutes carriers reported here, and the remaining four split what is left.
- 74%Carrier
- 22%Extreme weather
- 5%National Airspace System
Extreme weather accounts for 22% 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 3.6 times the usual weather exposure. The split is drawn from 5,987 reported delay minutes.
The largest share of delay minutes, 74%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,403 of the 5,987 delay minutes reported here.
Cancellations are rare at 0.71%, 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 4.1% 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 11am–2pm window matters as much as it does.
The return leg runs 91.1% 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 BIL to SLC
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 89.9% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 701 completed flights over 12 months sit behind that.
Related
Where to go next
- BIL to SLC, every carrier
- SkyWest on SLC to BIL, the return leg
- Delta Air Lines on BIL to SLC94.0%
- SkyWest Airlines network-wide record
- Salt Lake City International (SLC) delay statistics
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
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.