Flight number record
OO 4758
SkyWest Airlines · Billings to Denver
- Route
- BIL → DEN
- Departs
- 18:00
- Flights
- 305
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4758, check with SkyWest Airlines. SkyWest Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
OO 4758 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 305 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so OO 4758 runs 6 points behind the country as a whole. Across a thousand flights that is about 59 extra late arrivals.
Key figures
On time
71.4%
Arrivals under 15 minutes late, of 297 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
2.62%
National rate is 1.89%
1 hour+ late
9.4%
National rate is 8.3%
These figures cover 305 flights between September 2025 and August 2026. Beyond the headline rate, 9.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4758 flies
OO 4758 flies BIL to DEN without a single fixed slot. Its most common scheduled departure was 18:00, used on 81 of 305 flights, with 17:51 (54 flights) and 17:57 (52 flights) next.
- Departs 18:0081 flights26.6%
- Departs 17:5154 flights17.7%
- Departs 17:5752 flights17.0%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 18:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4758 runs 3 points better at 71.4%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
OO 4758 next to BIL to DEN
Every carrier on BIL to DEN combined arrived on time 82.5% of the time across 1,774 flights, so OO 4758 is 11 points behind it. SkyWest flew 1,049 flights on the same city pair under all its flight numbers, including this one, and those ran 81.3% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4758thin sample | 305 | 71.4% | 63 min | 2.62% | C |
| All SkyWest Airlines on BIL–DEN | 1,049 | 81.3% | 91 min | 1.43% | B |
| All carriers on BIL–DEN | 1,774 | 82.5% | 89 min | 0.96% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4758 quarter by quarter
OO 4758 did not run the same all year. Its best quarter was Apr–Jun 2026 at 78.9% on time and its weakest Jul–Sep 2025 at 53.3%, a swing of 26 points on roughly 61 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights53.3%
- Oct–Dec 202591 flights74.7%
- Jan–Mar 202653 flights74.5%
- Apr–Jun 202691 flights78.9%
- Jul–Sep 202640 flights56.4%
Scale runs 45% to 85%.
By weekday, OO 4758 did best on Tuesday at 81.0% on time and worst on Thursday at 59.5%. Each day rests on about 44 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4758 runs when it is late
The 85 late arrivals split 29 under half an hour, 28 between 30 and 60 minutes, and 28 an hour or more.
- 15+ min early42 flights14.1%
- Within 15 min170 flights57.2%
- 15–29 min late29 flights9.8%
- 30–59 min late28 flights9.4%
- 1–2 hours late18 flights6.1%
- 2+ hours late10 flights3.4%
Scale runs 0% to 100%.
Share of 297 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 71 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 19 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DEN.
The worst days
Worst days for OO 4758
The latest arrival of the period was on 28 November 2025, 5 hours 19 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 November 2025 | 5 hours 19 minutes | Late-arriving aircraft |
| 14 March 2026 | 4 hours 53 minutes | Late-arriving aircraft |
| 26 November 2025 | 4 hours 10 minutes | Carrier |
| 6 September 2025 | 3 hours 58 minutes | Late-arriving aircraft |
| 30 October 2025 | 3 hours 43 minutes | Carrier |
Delay causes
Why OO 4758 runs late
Late-arriving aircraft accounts for 43% of the 5,385 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 25%Carrier
- 20%National Airspace System
- 12%Extreme weather
Extreme weather accounts for 12% 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 quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 5,385 delay minutes reported on OO 4758.
Cancellations run at 2.62%, against 1.89% nationally. That is about one flight in 40 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
9.4% 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.
The same number turns up on five other city pairs in the data, including TUS to DEN (35), MRY to SFO (18) and SFO to PDX (3), but none flew often enough under OO 4758 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BIL to DEN only.
One caution: this is a thin sample. 305 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 OO 4758
For a booking, the cancellation rate is the figure to plan around on OO 4758: 2.62% of its 305 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BIL to DEN, every carrier and departure
- DEN to BIL, the return direction
- United Airlines 478 on the same route76.4%
- United Airlines 372 on the same route91.8%
- Denver International (DEN) delay statistics
- SkyWest Airlines on-time record
- Every SkyWest Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means SkyWest Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
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.