Flight number record
OO 4665
SkyWest Airlines · Denver to Bismarck
- Route
- DEN → BIS
- Departs
- 17:35
- Flights
- 347
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4665, 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 4665 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 347 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so OO 4665 runs 8 points behind the country as a whole. Across a thousand flights that is about 77 extra late arrivals.
Key figures
On time
69.6%
Arrivals under 15 minutes late, of 345 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
0.58%
National rate is 1.89%
1 hour+ late
14.5%
National rate is 8.3%
These figures cover 347 flights between September 2025 and August 2026. Beyond the headline rate, 14.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 4665 flies
OO 4665 flies DEN to BIS without a single fixed slot. Its most common scheduled departure was 17:35, used on 81 of 347 flights, with 17:40 (69 flights) and 17:55 (41 flights) next.
- Departs 17:3581 flights23.3%
- Departs 17:4069 flights19.9%
- Departs 17:5541 flights11.8%
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 17:35 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 4665 runs level with that at 69.6%. 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 4665 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 4665 is 7 points behind it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4665thin sample | 347 | 69.6% | 76 min | 0.58% | C+ |
| 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 4665 quarter by quarter
OO 4665 did not run the same all year. Its best quarter was Oct–Dec 2025 at 82.7% on time and its weakest Jul–Sep 2025 at 56.7%, a swing of 26 points on roughly 69 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 flights56.7%
- Oct–Dec 202575 flights82.7%
- Jan–Mar 202690 flights75.0%
- Apr–Jun 202691 flights60.4%
- Jul–Sep 202661 flights65.6%
Scale runs 50% to 90%.
By weekday, OO 4665 did best on Wednesday at 83.7% on time and worst on Saturday at 61.2%. Each day rests on about 50 flights, so a gap of 23 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 4665 runs when it is late
The 105 late arrivals split 32 under half an hour, 23 between 30 and 60 minutes, and 50 an hour or more.
- 15+ min early81 flights23.5%
- Within 15 min159 flights46.1%
- 15–29 min late32 flights9.3%
- 30–59 min late23 flights6.7%
- 1–2 hours late31 flights9.0%
- 2+ hours late19 flights5.5%
Scale runs 0% to 100%.
Share of 345 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 102 departures that left 15 minutes late or more, only 10 made it up before arrival. 13 flights left on time and still arrived late.
The worst days
Worst days for OO 4665
The latest arrival of the period was on 11 February 2026, 12 hours 34 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across February, June, May and December, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 February 2026 | 12 hours 34 minutes | Late-arriving aircraft |
| 21 June 2026 | 3 hours 49 minutes | Extreme weather |
| 17 February 2026 | 3 hours 35 minutes | National Airspace System |
| 3 May 2026 | 3 hours 26 minutes | Carrier |
| 19 December 2025 | 3 hours 22 minutes | Extreme weather |
Delay causes
Why OO 4665 runs late
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 7,980 reported delay minutes.
- 40%Late-arriving aircraft
- 28%Carrier
- 21%National Airspace System
- 11%Extreme weather
Extreme weather accounts for 11% 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 1.8 times the usual weather exposure. The split is drawn from 7,980 delay minutes reported on OO 4665.
Cancellations are rare at 0.58%, below the national 1.89% 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 routes
What a delay on this flight costs
14.5% 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 three other city pairs in the data, including BNA to ORD (16), RDD to LAX (1) and IAH to OMA (1), but none flew often enough under OO 4665 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. 347 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 4665
For a booking, OO 4665 is a flight to put a long connection behind. 14.5% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
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 4799 on the same route75.5%
- 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.