Flight number record
OO 5402
SkyWest Airlines · Milwaukee to Chicago
- Route
- MKE → ORD
- Departs
- 08:30
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s OO 5402, 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 5402 sits in the middle of the pack with a B−. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 362 flights, with a median arrival 1 minute early.
Key figures
On time
75.1%
Arrivals under 15 minutes late, of 350 completed flights
Avg delay
85 min
Across delayed arrivals only, not all flights
Cancelled
3.31%
National rate is 1.89%
1 hour+ late
11.4%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. Beyond the headline rate, 11.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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 5402 flies
OO 5402 flies MKE to ORD without a single fixed slot. Its most common scheduled departure was 08:30, used on 139 of 362 flights, with 08:50 (69 flights) and 08:33 (58 flights) next.
- Departs 08:30139 flights38.4%
- Departs 08:5069 flights19.1%
- Departs 08:3358 flights16.0%
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 08:30 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and OO 5402 runs 9 points worse at 75.1%. 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 5402 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 5402 is 7 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 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OO 5402thin sample | 362 | 75.1% | 85 min | 3.31% | 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 5402 quarter by quarter
OO 5402 did not run the same all year. Its best quarter was Jul–Sep 2026 at 83.3% on time and its weakest Jan–Mar 2026 at 67.4%, a swing of 16 points on roughly 72 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 flights76.7%
- Oct–Dec 202590 flights70.8%
- Jan–Mar 202690 flights67.4%
- Apr–Jun 202691 flights81.2%
- Jul–Sep 202661 flights83.3%
Scale runs 60% to 90%.
By weekday, OO 5402 did best on Tuesday at 92.0% on time and worst on Sunday at 60.8%. Each day rests on about 52 flights, so a gap of 31 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OO 5402 runs when it is late
The 87 late arrivals split 29 under half an hour, 18 between 30 and 60 minutes, and 40 an hour or more.
- 15+ min early64 flights18.3%
- Within 15 min199 flights56.9%
- 15–29 min late29 flights8.3%
- 30–59 min late18 flights5.1%
- 1–2 hours late19 flights5.4%
- 2+ hours late21 flights6.0%
Scale runs 0% to 100%.
Share of 350 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 62 departures that left 15 minutes late or more, only 7 made it up before arrival. In the other direction, 32 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 5402
The latest arrival of the period was on 1 August 2026, 6 hours 37 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across August, December, September and May, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 1 August 2026 | 6 hours 37 minutes | Late-arriving aircraft |
| 7 December 2025 | 6 hours | National Airspace System |
| 13 September 2025 | 5 hours 44 minutes | Extreme weather |
| 25 May 2026 | 5 hours 24 minutes | Carrier |
| 4 May 2026 | 5 hours 10 minutes | Carrier |
Delay causes
Why OO 5402 runs late
Carrier accounts for 58% of the 7,430 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Carrier
- 26%National Airspace System
- 9%Extreme weather
- 6%Late-arriving aircraft
The largest share of delay minutes, 58%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,336 of the 7,430 delay minutes reported here. The split is drawn from 7,430 delay minutes reported on OO 5402.
Cancellations run at 3.31%, against 1.89% nationally. That is about one flight in 30 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
11.4% 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 LNK to DEN (1), but none flew often enough under OO 5402 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. 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 5402
For a booking, the cancellation rate is the figure to plan around on OO 5402: 3.31% of its 362 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- MKE to ORD, every carrier and departure
- ORD to MKE, the return direction
- SkyWest Airlines 4803 on the same route76.6%
- SkyWest Airlines 5799 on the same route76.4%
- 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.