Flight number record
OO 4759
SkyWest Airlines · Denver to Sioux Falls
- Route
- DEN → FSD
- Departs
- 10:05
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 4759, 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 4759 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 362 flights, with a median arrival 10 minutes early.
Set against the rest of the country, OO 4759's record is 12 points better than the US average of 77.3%. That gap is worth roughly 116 fewer late arrivals for every thousand flights.
Key figures
On time
88.9%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
47 min
Across delayed arrivals only, not all flights
Cancelled
0.83%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Schedule
When OO 4759 flies
OO 4759 flies DEN to FSD without a single fixed slot. Its most common scheduled departure was 10:05, used on 70 of 362 flights, with 09:55 (62 flights) and 09:45 (54 flights) next.
- Departs 10:0570 flights19.3%
- Departs 09:5562 flights17.1%
- Departs 09:4554 flights14.9%
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 10:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 4759 runs 5 points better at 88.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
OO 4759 next to DEN to FSD
Every carrier on DEN to FSD combined arrived on time 82.8% of the time across 1,817 flights, so OO 4759 is 6 points ahead of it. SkyWest flew 1,313 flights on the same city pair under all its flight numbers, including this one, and those ran 85.5% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 4759thin sample | 362 | 88.9% | 47 min | 0.83% | A+ |
| All SkyWest Airlines on DEN–FSD | 1,313 | 85.5% | 78 min | 0.99% | A+ |
| All carriers on DEN–FSD | 1,817 | 82.8% | 80 min | 0.94% | B+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 4759 quarter by quarter
Quarter by quarter OO 4759 held fairly steady: 83.3% in Jul–Sep 2025, 87.8% in Oct–Dec 2025, 93.1% in Jan–Mar 2026, 90.0% in Apr–Jun 2026 and 85.5% in Jul–Sep 2026. A spread of 10 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights83.3%
- Oct–Dec 202591 flights87.8%
- Jan–Mar 202688 flights93.1%
- Apr–Jun 202691 flights90.0%
- Jul–Sep 202662 flights85.5%
Scale runs 75% to 100%.
By weekday, OO 4759 ranged from 84.0% on Sunday to 94.3% on Monday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 4759 runs when it is late
OO 4759 often beats the schedule: 121 of 359 completed flights, 34%, arrived 15 minutes or more early. The 40 late arrivals split 16 under half an hour, 15 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early121 flights33.7%
- Within 15 min198 flights55.2%
- 15–29 min late16 flights4.5%
- 30–59 min late15 flights4.2%
- 1–2 hours late7 flights1.9%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
10 of 40 late departures made up the time and arrived on time, 25% of them. 10 flights left on time and still arrived late.
The worst days
Worst days for OO 4759
The latest arrival of the period was on 28 December 2025, 2 hours 20 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across December, September and April, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 December 2025 | 2 hours 20 minutes | Extreme weather |
| 23 September 2025 | 2 hours 6 minutes | Carrier |
| 6 December 2025 | 1 hour 51 minutes | Extreme weather |
| 2 April 2026 | 1 hour 37 minutes | Late-arriving aircraft |
| 15 April 2026 | 1 hour 34 minutes | Carrier |
Delay causes
Why OO 4759 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 1,881 reported delay minutes.
- 37%Carrier
- 32%Late-arriving aircraft
- 16%Extreme weather
- 15%National Airspace System
- 0%Security
Extreme weather accounts for 16% 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 2.6 times the usual weather exposure. The split is drawn from 1,881 delay minutes reported on OO 4759.
Cancellations are rare at 0.83%, 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
Badly late arrivals are rare here: only 2.5% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The same number turns up on three other city pairs in the data, including ORD to BNA (1), LAX to SFO (1) and MSP to DEN (1), but none flew often enough under OO 4759 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to FSD only.
One caution: this is a thin sample. 362 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 4759
For a booking, OO 4759 has one of the better records a US domestic flight can show: 88.9% on time and 0.83% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- DEN to FSD, every carrier and departure
- FSD to DEN, the return direction
- SkyWest Airlines 5378 on the same route86.4%
- SkyWest Airlines 5700 on the same route80.5%
- United Airlines 645 on the same route75.8%
- 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
- Worst months to fly in the US, ranked by the data
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.