Flight number record
OO 5799
SkyWest Airlines · Milwaukee to Chicago
- Route
- MKE → ORD
- Departs
- 05:00
- Flights
- 322
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5799, 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 5799 lands a B, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That rests on 322 flights, with a median arrival 11 minutes early.
Key figures
On time
76.4%
Arrivals under 15 minutes late, of 314 completed flights
Avg delay
90 min
Across delayed arrivals only, not all flights
Cancelled
2.17%
National rate is 1.89%
1 hour+ late
10.2%
National rate is 8.3%
These figures cover 322 flights between September 2025 and August 2026. Beyond the headline rate, 10.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When OO 5799 flies
OO 5799 is scheduled to leave Milwaukee (MKE) at 05:00 local time and reach Chicago (ORD) at 06:10. That slot held for 269 of the 322 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 05:00269 flights83.5%
- Departs 05:1034 flights10.6%
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 05:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OO 5799 runs 13 points worse at 76.4%. 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 5799 next to MKE to ORD
Every carrier on MKE to ORD combined arrived on time 68.4% of the time across 5,344 flights, so OO 5799 is 8 points ahead of it. SkyWest flew 5,046 flights on the same city pair under all its flight numbers, including this one, and those ran 68.3% on time. Across its whole network SkyWest Airlines managed 78.7%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5799thin sample | 322 | 76.4% | 90 min | 2.17% | B |
| All SkyWest Airlines on MKE–ORD | 5,046 | 68.3% | 94 min | 4.22% | C− |
| All carriers on MKE–ORD | 5,344 | 68.4% | 93 min | 4.38% | C− |
| SkyWest Airlines, whole network | 855,406 | 78.7% | 88 min | 1.79% | B |
Across the year
OO 5799 quarter by quarter
OO 5799 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 50.0%, a swing of 43 points on roughly 64 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 flights93.3%
- Oct–Dec 202591 flights82.2%
- Jan–Mar 202688 flights79.8%
- Apr–Jun 202651 flights83.3%
- Jul–Sep 202662 flights50.0%
Scale runs 40% to 100%.
By weekday, OO 5799 did best on Friday at 84.4% on time and worst on Monday at 65.2%. Each day rests on about 46 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5799 runs when it is late
OO 5799 often beats the schedule: 147 of 314 completed flights, 47%, arrived 15 minutes or more early. The 74 late arrivals split 30 under half an hour, 12 between 30 and 60 minutes, and 32 an hour or more.
- 15+ min early147 flights46.8%
- Within 15 min93 flights29.6%
- 15–29 min late30 flights9.6%
- 30–59 min late12 flights3.8%
- 1–2 hours late11 flights3.5%
- 2+ hours late21 flights6.7%
Scale runs 0% to 100%.
Share of 314 completed flights by arrival against schedule.
7 of 48 late departures made up the time and arrived on time, 15% of them. In the other direction, 33 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 ORD.
The worst days
Worst days for OO 5799
The latest arrival of the period was on 5 July 2026, 7 hours 35 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 July 2026 | 7 hours 35 minutes | Carrier |
| 28 July 2026 | 5 hours 42 minutes | Late-arriving aircraft |
| 18 December 2025 | 4 hours 40 minutes | Carrier |
| 24 August 2026 | 4 hours 38 minutes | Carrier |
| 31 December 2025 | 4 hours 29 minutes | Late-arriving aircraft |
Delay causes
Why OO 5799 runs late
Carrier accounts for 71% of the 6,648 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Carrier
- 15%Late-arriving aircraft
- 8%Extreme weather
- 5%National Airspace System
The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,752 of the 6,648 delay minutes reported here. The split is drawn from 6,648 delay minutes reported on OO 5799.
Cancellations sit at 2.17% against a national 1.89%, which is ordinary. Diversions add another 0.31%.
Connections and routes
What a delay on this flight costs
10.2% 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 same number turns up on one other city pair in the data, including FCA to DEN (3), but none flew often enough under OO 5799 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to MKE to ORD only.
One caution: this is a thin sample. 322 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 5799
For a booking, read OO 5799 as 76.4% on time with 2.17% cancelled over 322 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- MKE to ORD, every carrier and departure
- ORD to MKE, the return direction
- SkyWest Airlines 5402 on the same route75.1%
- SkyWest Airlines 4803 on the same route76.6%
- SkyWest Airlines 4740 on the same route67.3%
- SkyWest Airlines 5648 on the same route52.3%
- Milwaukee Mitchell International (MKE) delay statistics
- Chicago O'Hare International (ORD) 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.