Flight profile · SkyWest Airlines
OO5799
Milwaukee (MKE) to Chicago (ORD) · scheduled 5:15 AM – 6:20 AM
How OO5799 performs
718 operations, March 2024 – July 2026.
OO5799 arrived on time 85.5% of the time, against 72.4% for all MKE → ORD flights, so this departure is 13.1 percentage points better than the route as a whole. Against SkyWest Airlines’ own flights on this route it is 13.4 points better.
Source: US DOT Bureau of Transportation Statistics · 718 operations, March 2024 – July 2026 · If OO5799 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
What stands out
How OO5799 compares to other flight numbers, not just to itself.
This flight runs unusually far ahead of the carrier's own average on this route, better than 97% of 11,589 comparable flight numbers.
85.5% on time for this specific departure, against 72.1% for the same carrier's other flights on this route.
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – July 2026 · The one thing about this specific departure that ranks most extreme against every other published flight number, out of everything FlyerIntel checks — shown only when something clears a real statistical bar, not for every flight.
Where OO5799 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
Ask for the position of OO5799 right now, if receivers on the ground are hearing it. Nothing is requested until you press the button.
Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| OO5799 | 85.5% | 1.81% | -19 min | 6.3% | 718 |
| SkyWest Airlines on MKE → ORD | 72.1% | 2.78% | -3 min | 12.5% | 10,528 |
| All MKE → ORD flights | 72.4% | 2.91% | -3 min | 12.3% | 11,098 |
OO5799 has cancelled 1.81% of its scheduled departures (13 of 718), against 2.91% for all MKE → ORD flights — this specific departure cancels 1.1 percentage points less often than the route as a whole. Different flight numbers on the same route can carry different aircraft, crews and schedules, so this is a fact about OO5799 specifically, not about the route it flies.
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – July 2026
Why OO5799 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
weather severe enough to stop this flight specifically
airspace and airport capacity, including weather-driven flow control
Share of the delay minutes US DOT attributed to each cause for OO5799 on MKE → ORD. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering March 2024 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies OO5799 comes in late, and what that does to the departure.
OO5799 is usually the aircraft’s first flight of the day: the schedule gives it a median of 8.5 hours on the ground at MKE, so its “inbound” is mostly the aircraft’s arrival the evening before.
When the aircraft came in 15 or more minutes late, OO5799 pushed back an average of 8 minutes late; when it came in on time or early, an average of 1 minute late.
Each departure is matched to the flight the same aircraft flew into MKE just before it, using the tail number in the DOT file, 564 of 705 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| OO5799 | 32% | 13% | 8% |
| Network, same turn | 29% | 12% | 9% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often OO5799’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often OO5799 left 15 or more minutes late is about the same as the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering March 2024 – July 2026
From pushback to gate
When it leaves MKE late, does that still matter by the time it reaches ORD?
OO5799 pushes back an average of 7.3 minutes late and reaches the gate at ORD an average of 3.4 minutes early. The 10.8 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 21.5 minutes on the taxiways at MKE, 5.7 minutes longer than a typical MKE departure in the same hour.
On arrival at ORD, OO5799 spends 10.5 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 7.3 minutes shorter than a typical ORD arrival (17.8 min).
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached ORD. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 5,881 departures from MKE scheduled in the clock hour OO5799 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at ORD (952,666 flights), not just OO5799’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – July 2026
The hour it leaves MKE
Part of any flight’s record belongs to the clock rather than to the flight. OO5799 has one departure time, so this is what that time is worth.
On-time arrival rate. 5,881 departures from MKE are scheduled in the 5 AM–6 AM hour over the period, against 87,869 across the whole day.
OO5799 is scheduled out of MKE at 5:15 AM, in the 5 AM–6 AM bank. Departures from MKE in that hour arrive on time 91.8% of the time against 80.7% across the airport’s whole day — the slot alone is worth 11.1 points better before anything about this particular flight is considered.
The two airport figures cover every departure from MKE to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · March 2024 – July 2026 · Hours below 120 departures are not scored.
Other routes OO5799 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| FCA→DEN Kalispell to Denver | May 21–25, 2026 | 3 | — |
| PHX→LAX Phoenix to Los Angeles | March 30, 2025 – April 30, 2025 | 32 | — |
| ORD→TVC Chicago to Traverse City | March 6–29, 2025 | 24 | — |
| ORD→DAY Chicago to Dayton | February 13, 2025 – March 5, 2025 | 21 | — |
| IAH→MEM Houston to Memphis | November 1–27, 2023 | 18 | — |
| MLI→DEN Moline to Denver | October 29, 2023 | 1 | — |
| IAH→DTW Houston to Detroit | October 14–15, 2023 | 2 | — |
| DTW→IAH Detroit to Houston | September 30, 2023 | 1 | — |
| IAH→SAT Houston to San Antonio | August 11–31, 2023 | 15 | — |
Because the same number has served different journeys, the statistics above describe only the route OO5799 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
28 min late
against a median of 19 min early
Percentiles over 718 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering March 2024 – July 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO5799 this flight | SkyWest Airlines | 85.5% | 19 min early | 718 |
| OO4803 | SkyWest Airlines | 81.1% | 6 min early | 1,001 |
| OO5402 | SkyWest Airlines | 74.7% | 1 min early | 1,058 |
| OO4740 | SkyWest Airlines | 74.1% | 1 min early | 960 |
| OO5648 | SkyWest Airlines | 58.3% | 9 min late | 894 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. OO5799 is placed in the same ordering rather than left out of it; the rows around it are the most punctual departures on the route, not all of them, so this is a comparison and not a rank. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 718 records of OO5799 operating MKE → ORD, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed