Flight profile · SkyWest Airlines
OO4803
Milwaukee (MKE) to Chicago (ORD) · scheduled 7:00 AM – 8:05 AM
How OO4803 performs
970 operations, 2023-09-29 to 2026-06-30.
OO4803 arrived on time 81.7% of the time, against 72.5% for all MKE → ORD flights — this specific departure is 9.2 percentage points better than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 9.5 points better.
Source: US DOT Bureau of Transportation Statistics · 970 operations between 2023-09-29 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO4803 | 81.7% | 1.55% | -6 min | 10.9% | 970 |
| SkyWest Airlines on MKE → ORD | 72.1% | 2.65% | -3 min | 12.6% | 10,076 |
| All MKE → ORD flights | 72.5% | 2.79% | -3 min | 12.4% | 10,637 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-29 to 2026-06-30
By day of week
Does OO4803 run worse on particular days?
Wednesday is historically the most reliable day and Tuesday the least, a gap of 11.1 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-09-29 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes OO4803 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 |
|---|---|---|---|
| AMA→IAH Amarillo to Houston | 2025-03-30 – 2025-04-30 | 32 | — |
| LIT→ORD Little Rock to Chicago | 2024-12-03 – 2024-12-03 | 1 | — |
| ORD→CRW Chicago to Charleston | 2023-09-05 – 2023-09-28 | 24 | — |
| SUN→SFO Hailey to San Francisco | 2023-07-03 – 2023-09-04 | 46 | — |
| DCA→ORD Washington to Chicago | 2023-08-05 – 2023-09-03 | 10 | — |
| EUG→SFO Eugene to San Francisco | 2023-07-01 – 2023-07-30 | 10 | — |
Because the same number has served different journeys, the statistics above describe only the route OO4803 currently operates. Blending them would produce an average of two different flights.
Why OO4803 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for OO4803 on MKE → ORD. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Other departures on MKE → ORD
Same airports, same journey — and not the same odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| OO5799 | SkyWest Airlines | 86.9% | 20 min early | 687 |
| OO5402 | SkyWest Airlines | 74.4% | 1 min early | 1,027 |
| OO4740 | SkyWest Airlines | 74.1% | 1 min early | 960 |
| OO5648 | SkyWest Airlines | 58.2% | 9 min late | 867 |
Every departure listed carries at least 600 operations, so the comparison is between figures that mean something. Schedules change; confirm the departure still operates before booking around this.
Data and methodology
Calculated by FlyerIntel from 970 records of OO4803 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.