Flight number record
OO 4799
SkyWest Airlines · Denver to Bismarck
- Route
- DEN → BIS
- Departs
- 20:50
- Flights
- 330
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 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 77.6%. The late ones land close to two hours behind schedule. That rests on 330 flights, with a median arrival 6 minutes early.
Key figures
On time
75.2%
Arrivals under 15 minutes late, of 326 completed flights
Avg delay
122 min
Across delayed arrivals only, not all flights
Cancelled
0.91%
National rate is 1.81%
1 hour+ late
10.7%
National rate is 8.1%
These figures cover 330 flights between July 2025 and June 2026. Beyond the headline rate, 10.7% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When OO 4799 flies
OO 4799 flies DEN to BIS without a single fixed slot. Its most common scheduled departure was 20:50, used on 130 of 330 flights, with 20:55 (123 flights) and 20:54 (33 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 20:50130 flights39.4%
- Departs 20:55123 flights37.3%
- Departs 20:5433 flights10.0%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 20:50 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and OO 4799 runs 5 points better at 75.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
OO 4799 next to DEN to BIS
Every carrier on DEN to BIS combined arrived on time 76.2% of the time across 1,502 flights, so OO 4799 is about level with it. Across its whole network SkyWest Airlines managed 79.0%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4799thin sample | 330 | 75.2% | 122 min | 0.91% | B+ |
| All SkyWest Airlines on DEN–BIS | 1,502 | 76.2% | 88 min | 0.73% | B+ |
| All carriers on DEN–BIS | 1,502 | 76.2% | 88 min | 0.73% | B+ |
| SkyWest Airlines, whole network | 852,935 | 79.0% | 88 min | 1.77% | 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 2025 at 60.0%, a swing of 23 points on roughly 83 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 202588 flights60.0%
- Oct–Dec 202582 flights81.7%
- Jan–Mar 202676 flights82.7%
- Apr–Jun 202684 flights77.4%
Scale runs 50% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, OO 4799 did best on Thursday at 82.4% on time and worst on Friday at 66.7%. Each day rests on about 47 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Delay causes
Why OO 4799 runs late
One category carries most of the weight here. Carrier accounts for 53% of the 9,881 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.
- 53%Carrier
- 24%Late-arriving aircraft
- 13%National Airspace System
- 10%Extreme weather
The largest share of delay minutes, 53%, 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 5,223 of the 9,881 delay minutes reported here. The split is drawn from 9,881 delay minutes reported on OO 4799.
Cancellations sit at 0.91% against a national 1.81%, which is ordinary. Diversions add another 0.30%.
Connections and routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.7% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on nine other city pairs in the data, including PSP to DEN (29), SAF to DEN (6) 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. 330 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 75.2% on time with 0.91% cancelled over 330 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 route83.3%
- SkyWest Airlines 4665 on the same route64.6%
- SkyWest Airlines 4664 on the same route78.1%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.