Flight profile · SkyWest Airlines
OO5121
Eau Claire (EAU) to Chicago (ORD) · scheduled 5:00 AM – 6:37 AM
How OO5121 performs
505 operations, 2024-12-13 to 2026-06-30.
OO5121 arrived on time 82.4% of the time, against 74.7% for all EAU → ORD flights — this specific departure is 7.8 percentage points better than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 7.8 points better.
Source: US DOT Bureau of Transportation Statistics · 505 operations between 2024-12-13 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO5121 | 82.4% | 3.96% | -10 min | 9.1% | 505 |
| SkyWest Airlines on EAU → ORD | 74.7% | 3.83% | -6 min | 13.1% | 967 |
| All EAU → ORD flights | 74.7% | 3.83% | -6 min | 13.1% | 967 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-12-13 to 2026-06-30
Other routes OO5121 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 |
|---|---|---|---|
| ORD→DEC Chicago to Decatur | 2024-12-19 – 2026-06-29 | 74 | — |
| ORD→FOD Chicago to Fort Dodge | 2025-01-07 – 2026-03-27 | 127 | 76.5% |
| ORD→MCW Chicago to Mason City | 2025-08-20 – 2025-09-24 | 26 | — |
| ORD→PLN Chicago to Pellston | 2025-05-22 – 2025-06-23 | 25 | — |
| WYS→DEN West Yellowstone to Denver | 2024-09-28 – 2024-09-28 | 1 | — |
| ORD→SLN Chicago to Salina | 2024-08-20 – 2024-09-24 | 11 | — |
| JLN→ORD Joplin to Chicago | 2024-06-02 – 2024-07-04 | 33 | — |
| LAR→DEN Laramie to Denver | 2023-09-29 – 2023-09-30 | 2 | — |
Because the same number has served different journeys, the statistics above describe only the route OO5121 currently operates. Blending them would produce an average of two different flights.
Why OO5121 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
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 OO5121 on EAU → ORD. A single late flight can carry more than one cause, and only delays of fifteen minutes or more are attributed at all.
Data and methodology
Calculated by FlyerIntel from 505 records of OO5121 operating EAU → 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.
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