Carrier route record
OOBIL→SLC
SkyWest Airlines · Billings to Salt Lake City
- 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 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 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 708 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 77.6%. That gap is worth roughly 131 fewer late arrivals for every thousand flights.
Key figures
On time
90.7%
Arrivals under 15 minutes late, of 702 completed flights
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
0.71%
National rate is 1.81%
Whole route
91.6%
Every carrier on BIL to SLC, 1,074 flights
These figures cover 708 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 BIL to SLC
SkyWest flew 708 of the 1,074 flights on BIL to SLC, most of the route. Its 90.7% on time is about level with the route as a whole at 91.6%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from Delta at 93.1% to SkyWest at 90.7%.
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 |
|---|---|---|---|---|---|
| Delta Air Lines | 366 | 93.1% | 97 min | 0.55% | A+ |
| SkyWest Airlines (this page) | 708 | 90.7% | 79 min | 0.71% | A+ |
Flight by flight
SkyWest flight numbers on BIL to SLC
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–11am—
- 11am–2pm363 flights95.0%
- 2pm–5pm2 flights—
- 5pm–8pm343 flights86.2%
- 8pm–5am—
Scale runs 80% 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 95.0% on time, ahead of 5pm–8pm at 86.2%. 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 363 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 95.1% on time and Wednesday the weakest at 86.1%. 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 79% of the 5,133 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.
- 79%Carrier
- 16%Extreme weather
- 5%National Airspace System
Extreme weather accounts for 16% 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 2.6 times the usual weather exposure. The split is drawn from 5,133 reported delay minutes.
The largest share of delay minutes, 79%, 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 4,061 of the 5,133 delay minutes reported here.
Cancellations are rare at 0.71%, 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 3.4% 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 11am–2pm window matters as much as it does.
The return leg runs 91.9% 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 BIL to SLC
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 90.7% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 702 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 SLC93.1%
- SkyWest Airlines network-wide record
- Salt Lake City International (SLC) delay statistics
- The best time of day to fly, according to 7.04 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.