Flight profile · SkyWest Airlines
OO5555
Chicago (ORD) to Milwaukee (MKE) · scheduled 5:50 PM – 7:10 PM
How OO5555 performs
972 operations, 2023-10-29 to 2026-06-30.
OO5555 arrived on time 62.5% of the time, against 68.6% for all ORD → MKE flights — this specific departure is 6.1 percentage points worse than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 5.6 points worse.
Source: US DOT Bureau of Transportation Statistics · 972 operations between 2023-10-29 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO5555 | 62.5% | 2.37% | 3 min | 16.8% | 972 |
| SkyWest Airlines on ORD → MKE | 68.1% | 2.80% | 0 min | 14.3% | 10,080 |
| All ORD → MKE flights | 68.6% | 2.88% | -1 min | 14.0% | 10,638 |
Source: FlyerIntel analysis of US DOT BTS data · 2023-10-29 to 2026-06-30
By day of week
Does OO5555 run worse on particular days?
Saturday is historically the most reliable day and Sunday the least, a gap of 14.5 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · 2023-10-29 to 2026-06-30 · Days with fewer than 120 operations are not scored.
Other routes OO5555 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 |
|---|---|---|---|
| BNA→ORD Nashville to Chicago | 2026-06-26 – 2026-06-26 | 1 | — |
| SGF→DEN Springfield to Denver | 2023-09-29 – 2023-10-28 | 30 | — |
| XNA→DEN Fayetteville/Springdale/Rogers to Denver | 2023-09-05 – 2023-09-28 | 24 | — |
| DEN→COS Denver to Colorado Springs | 2023-09-04 – 2023-09-04 | 1 | — |
| CHS→ORD Charleston to Chicago | 2023-07-08 – 2023-08-26 | 28 | — |
Because the same number has served different journeys, the statistics above describe only the route OO5555 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 972 records of OO5555 operating ORD → MKE, 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.