Flight number record
OO 4799
SkyWest Airlines · Denver to Bismarck
- Route
- DEN → BIS
- Departs
- 20:55
- Flights
- 321
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4799, 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 4799 sits in the middle of the pack with a B+. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land close to two hours behind schedule. That rests on 321 flights, with a median arrival 7 minutes early.
Key figures
On time
75.5%
Arrivals under 15 minutes late, of 318 completed flights
Avg delay
104 min
Across delayed arrivals only, not all flights
Cancelled
0.93%
National rate is 1.89%
1 hour+ late
10.7%
National rate is 8.3%
These figures cover 321 flights between September 2025 and August 2026. Beyond the headline rate, 10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4799 flies
OO 4799 flies DEN to BIS without a single fixed slot. Its most common scheduled departure was 20:55, used on 141 of 321 flights, with 20:50 (68 flights) and 20:25 (49 flights) next.
- Departs 20:55141 flights43.9%
- Departs 20:5068 flights21.2%
- Departs 20:2549 flights15.3%
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 20:55 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and OO 4799 runs 5 points better at 75.5%. 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 4799 next to DEN to BIS
Every carrier on DEN to BIS combined arrived on time 76.9% of the time across 1,433 flights, so OO 4799 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4799thin sample | 321 | 75.5% | 104 min | 0.93% | B+ |
| All SkyWest Airlines on DEN–BIS | 1,433 | 76.9% | 86 min | 0.70% | B+ |
| All carriers on DEN–BIS | 1,433 | 76.9% | 86 min | 0.70% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4799 quarter by quarter
OO 4799 did not run the same all year. Its best quarter was Jan–Mar 2026 at 82.7% on time and its weakest Jul–Sep 2026 at 49.0%, a swing of 34 points on roughly 80 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 202526 flights—
- Oct–Dec 202582 flights81.7%
- Jan–Mar 202676 flights82.7%
- Apr–Jun 202684 flights77.4%
- Jul–Sep 202653 flights49.0%
Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4799 did best on Thursday at 86.0% on time and worst on Monday at 67.9%. Each day rests on about 46 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4799 runs when it is late
OO 4799 often beats the schedule: 100 of 318 completed flights, 31%, arrived 15 minutes or more early. The 78 late arrivals split 17 under half an hour, 27 between 30 and 60 minutes, and 34 an hour or more.
- 15+ min early100 flights31.4%
- Within 15 min140 flights44.0%
- 15–29 min late17 flights5.3%
- 30–59 min late27 flights8.5%
- 1–2 hours late23 flights7.2%
- 2+ hours late11 flights3.5%
Scale runs 0% to 100%.
Share of 318 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 73 departures that left 15 minutes late or more, only 7 made it up before arrival. 12 flights left on time and still arrived late.
The worst days
Worst days for OO 4799
The latest arrival of the period was on 30 November 2025, 15 hours 29 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 |
|---|---|---|
| 30 November 2025 | 15 hours 29 minutes | Carrier |
| 7 June 2026 | 12 hours 41 minutes | Late-arriving aircraft |
| 27 December 2025 | 12 hours 16 minutes | Carrier |
| 21 January 2026 | 11 hours 35 minutes | Carrier |
| 18 March 2026 | 9 hours 52 minutes | Carrier |
Delay causes
Why OO 4799 runs late
Carrier accounts for 52% of the 8,074 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Carrier
- 27%Late-arriving aircraft
- 17%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 52%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,207 of the 8,074 delay minutes reported here. The split is drawn from 8,074 delay minutes reported on OO 4799.
Cancellations sit at 0.93% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
10.7% 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 516 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The same number turns up on nine other city pairs in the data, including SAF to DEN (67), PSP to DEN (29) and ORD to BOI (5), but none flew often enough under OO 4799 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to BIS only.
One caution: this is a thin sample. 321 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 4799
For a booking, read OO 4799 as 75.5% on time with 0.93% cancelled over 321 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DEN to BIS, every carrier and departure
- BIS to DEN, the return direction
- SkyWest Airlines 4663 on the same route84.7%
- SkyWest Airlines 4665 on the same route69.6%
- 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
- How often a connection fails at the major US hubs
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.