Carrier route record
OOBIL→DEN
SkyWest Airlines · Billings to Denver
- Flights
- 1,049
- Period
- September 2025 to August 2026
- Share of route
- 59%
- 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 DEN lands a B, 4 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 1,049 flights, with a median arrival 10 minutes early.
Set against the rest of the country, SkyWest's BIL to DEN record is 4 points better than the US average of 77.3%. That gap is worth roughly 40 fewer late arrivals for every thousand flights.
Key figures
On time
81.3%
Arrivals under 15 minutes late, of 1,032 completed flights
Avg delay
91 min
Across delayed arrivals only, not all flights
Cancelled
1.43%
National rate is 1.89%
Whole route
82.5%
Every carrier on BIL to DEN, 1,774 flights
These figures cover 1,049 flights between September 2025 and August 2026. Beyond the headline rate, 9.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
SkyWest against every carrier on BIL to DEN
SkyWest flew 1,049 of the 1,774 flights on BIL to DEN, most of the route. Its 81.3% on time is about level with the route as a whole at 82.5%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 84.1% to SkyWest at 81.3%.
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 |
|---|---|---|---|---|---|
| United Airlines | 725 | 84.1% | 85 min | 0.28% | B+ |
| SkyWest Airlines (this page) | 1,049 | 81.3% | 91 min | 1.43% | B |
Flight by flight
SkyWest flight numbers on BIL to DEN
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 matters more here than the choice of carrier. The gap between the best and worst window is 31 points, against half a point between the best and worst carrier.
- 5am–8am219 flights94.1%
- 8am–11am268 flights92.1%
- 11am–2pm94 flights90.2%
- 2pm–5pm145 flights63.4%
- 5pm–8pm323 flights68.7%
- 8pm–5am—
Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 94.1% of the time, against 63.4% for the afternoon window. That is 31 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 323 flights scheduled in it.
Across the year
SkyWest on BIL to DEN through the year
August is the worst month at 67.0% on time, 24 points below October, the best at 91.4%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. August was the busiest month here, with 119 flights.
Across the week, Saturday is the strongest day at 87.2% on time and Monday the weakest at 78.1%, a spread of 9 points.
Arrival by arrival
How late SkyWest on BIL to DEN runs when it is late
SkyWest on BIL to DEN often beats the schedule: 433 of 1,032 completed flights, 42%, arrived 15 minutes or more early. The 193 late arrivals split 56 under half an hour, 44 between 30 and 60 minutes, and 93 an hour or more.
- 15+ min early433 flights42.0%
- Within 15 min406 flights39.3%
- 15–29 min late56 flights5.4%
- 30–59 min late44 flights4.3%
- 1–2 hours late53 flights5.1%
- 2+ hours late40 flights3.9%
Scale runs 0% to 100%.
Share of 1,032 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 157 departures that left 15 minutes late or more, only 11 made it up before arrival. 47 flights left on time and still arrived late.
The worst days
Worst days for SkyWest on BIL to DEN
The latest arrival of the period was on 11 August 2026, 17 hours 19 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 August 2026 | 17 hours 19 minutes | Late-arriving aircraft |
| 1 June 2026 | 8 hours 45 minutes | Late-arriving aircraft |
| 29 November 2025 | 7 hours 43 minutes | Carrier |
| 11 July 2026 | 6 hours 17 minutes | Late-arriving aircraft |
| 23 August 2026 | 6 hours 17 minutes | Late-arriving aircraft |
Delay causes
Why SkyWest runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 17,000 reported delay minutes.
- 39%Late-arriving aircraft
- 30%Carrier
- 22%National Airspace System
- 10%Extreme weather
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 17,000 reported delay minutes here, that single category outweighs weather by 4 to one. The split is drawn from 17,495 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 94.1% on time here.
Cancellations sit at 1.43% against a national 1.89%, which is ordinary. Diversions add another 0.19%.
Connections and stage length
What a delay here costs
9.0% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 455 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 5am–8am window matters as much as it does.
The return leg runs 81.1% on time across 1,049 flights, within half 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. 1,049 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 DEN
Put together: treat all of this as provisional. 1,049 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 81.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,032 completed flights over 12 months sit behind that.
Related
Where to go next
- BIL to DEN, every carrier
- SkyWest on DEN to BIL, the return leg
- United Airlines on BIL to DEN84.1%
- SkyWest Airlines network-wide record
- Denver International (DEN) delay statistics
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
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.