Flight number record
OO 5104
SkyWest Airlines · Denver to Sioux City
- Route
- DEN → SUX
- Departs
- 08:05
- Flights
- 338
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5104, 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 5104 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 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 338 flights, with a median arrival 13 minutes early.
Set against the rest of the country, OO 5104's record is 10 points better than the US average of 77.3%. That gap is worth roughly 104 fewer late arrivals for every thousand flights.
Key figures
On time
87.7%
Arrivals under 15 minutes late, of 333 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
1.18%
National rate is 1.89%
1 hour+ late
3.9%
National rate is 8.3%
These figures cover 338 flights between September 2025 and August 2026. The median arrival is 13 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When OO 5104 flies
OO 5104 flies DEN to SUX without a single fixed slot. Its most common scheduled departure was 08:05, used on 113 of 338 flights, with 08:15 (103 flights) and 15:35 (70 flights) next.
- Departs 08:05113 flights33.4%
- Departs 08:15103 flights30.5%
- Departs 15:3570 flights20.7%
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 08:05 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5104 runs 4 points better at 87.7%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
OO 5104 next to DEN to SUX
Every carrier on DEN to SUX combined arrived on time 84.3% of the time across 536 flights, so OO 5104 is 3 points ahead of it. Across its whole network SkyWest Airlines managed 78.7%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5104thin sample | 338 | 87.7% | 63 min | 1.18% | A |
| All SkyWest Airlines on DEN–SUX | 536 | 84.3% | 95 min | 1.12% | B |
| All carriers on DEN–SUX | 536 | 84.3% | 95 min | 1.12% | B |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5104 quarter by quarter
OO 5104 did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.2% on time and its weakest Oct–Dec 2025 at 80.7%, a swing of 12 points on roughly 85 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 20256 flights—
- Oct–Dec 202590 flights80.7%
- Jan–Mar 202689 flights89.7%
- Apr–Jun 202691 flights92.2%
- Jul–Sep 202662 flights87.1%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, OO 5104 did best on Tuesday at 93.8% on time and worst on Monday at 77.6%. Each day rests on about 48 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5104 runs when it is late
OO 5104 often beats the schedule: 149 of 333 completed flights, 45%, arrived 15 minutes or more early. The 41 late arrivals split 15 under half an hour, 13 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early149 flights44.7%
- Within 15 min143 flights42.9%
- 15–29 min late15 flights4.5%
- 30–59 min late13 flights3.9%
- 1–2 hours late6 flights1.8%
- 2+ hours late7 flights2.1%
Scale runs 0% to 100%.
Share of 333 completed flights by arrival against schedule.
8 of 40 late departures made up the time and arrived on time, 20% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for OO 5104
The latest arrival of the period was on 19 December 2025, 4 hours 15 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 December 2025 | 4 hours 15 minutes | National Airspace System |
| 10 July 2026 | 3 hours 48 minutes | Late-arriving aircraft |
| 22 May 2026 | 3 hours 32 minutes | Late-arriving aircraft |
| 6 August 2026 | 3 hours | Late-arriving aircraft |
| 24 January 2026 | 2 hours 42 minutes | Carrier |
Delay causes
Why OO 5104 runs late
Carrier accounts for 46% of the 2,586 delay minutes carriers reported here, and the remaining four split what is left.
- 46%Carrier
- 32%Late-arriving aircraft
- 20%National Airspace System
- 1%Security
- 1%Extreme weather
The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,189 of the 2,586 delay minutes reported here. The split is drawn from 2,586 delay minutes reported on OO 5104.
Cancellations sit at 1.18% against a national 1.89%, which is ordinary. Diversions add another 0.30%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.9% 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 six other city pairs in the data, including SUX to DEN (48), PIR to DEN (41) and LAR to DEN (22), but none flew often enough under OO 5104 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DEN to SUX only.
One caution: this is a thin sample. 338 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 5104
For a booking, OO 5104 has one of the better records a US domestic flight can show: 87.7% on time and 1.18% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- 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
- The best time of day to fly, according to 7.05 million flight records
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.