Flight number record
OO 5512
SkyWest Airlines · Denver to Moline
- Route
- DEN → MLI
- Departs
- 17:38
- Flights
- 363
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5512, 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 5512 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 6 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 363 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so OO 5512 runs 6 points behind the country as a whole. Across a thousand flights that is about 58 extra late arrivals.
Key figures
On time
71.5%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
77 min
Across delayed arrivals only, not all flights
Cancelled
0.28%
National rate is 1.89%
1 hour+ late
11.6%
National rate is 8.3%
These figures cover 363 flights between September 2025 and August 2026. Beyond the headline rate, 11.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5512 flies
OO 5512 flies DEN to MLI without a single fixed slot. Its most common scheduled departure was 17:38, used on 81 of 363 flights, with 17:25 (60 flights) and 17:40 (52 flights) next.
- Departs 17:3881 flights22.3%
- Departs 17:2560 flights16.5%
- Departs 17:4052 flights14.3%
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 17:38 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and OO 5512 runs 4 points better at 71.5%. 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 5512 next to DEN to MLI
Every carrier on DEN to MLI combined arrived on time 71.4% of the time across 366 flights, so OO 5512 is about level with it. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5512thin sample | 363 | 71.5% | 77 min | 0.28% | C+ |
| All SkyWest Airlines on DEN–MLI | 366 | 71.4% | 82 min | 0.27% | C+ |
| All carriers on DEN–MLI | 366 | 71.4% | 82 min | 0.27% | C+ |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5512 quarter by quarter
OO 5512 did not run the same all year. Its best quarter was Jan–Mar 2026 at 82.2% on time and its weakest Jul–Sep 2026 at 49.2%, a swing of 33 points on roughly 73 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 flights63.3%
- Oct–Dec 202591 flights76.9%
- Jan–Mar 202690 flights82.2%
- Apr–Jun 202691 flights72.5%
- Jul–Sep 202661 flights49.2%
Scale runs 40% to 90%.
By weekday, OO 5512 ranged from 67.3% on Wednesday to 76.5% on Thursday. With about 52 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late OO 5512 runs when it is late
OO 5512 often beats the schedule: 113 of 361 completed flights, 31%, arrived 15 minutes or more early. The 103 late arrivals split 30 under half an hour, 31 between 30 and 60 minutes, and 42 an hour or more.
- 15+ min early113 flights31.3%
- Within 15 min145 flights40.2%
- 15–29 min late30 flights8.3%
- 30–59 min late31 flights8.6%
- 1–2 hours late25 flights6.9%
- 2+ hours late17 flights4.7%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
13 of 92 late departures made up the time and arrived on time, 14% of them. In the other direction, 24 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MLI.
The worst days
Worst days for OO 5512
The latest arrival of the period was on 27 December 2025, 12 hours 46 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On four of the five worst days the largest share was filed as extreme weather.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 27 December 2025 | 12 hours 46 minutes | Late-arriving aircraft |
| 29 July 2026 | 3 hours 50 minutes | Extreme weather |
| 21 August 2026 | 3 hours 47 minutes | Extreme weather |
| 8 June 2026 | 3 hours 41 minutes | Extreme weather |
| 22 July 2026 | 3 hours 33 minutes | Extreme weather |
Delay causes
Why OO 5512 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 7,899 reported delay minutes.
- 31%Late-arriving aircraft
- 29%Carrier
- 21%National Airspace System
- 19%Extreme weather
Extreme weather accounts for 19% 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 3.1 times the usual weather exposure. The split is drawn from 7,899 delay minutes reported on OO 5512.
Cancellations are rare at 0.28%, 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
11.6% 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 751 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.
Every one of the 363 flights under OO 5512 in the data flew DEN to MLI. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 363 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 5512
For a booking, read OO 5512 as 71.5% on time with 0.28% cancelled over 363 flights. Those are rates from the past twelve months, not a forecast for any particular 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
- 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.