Flight profile · SkyWest Airlines
OO4109
Atlanta (ATL) to South Bend (SBN) · scheduled 7:35 PM – 9:30 PM
How OO4109 performs
530 operations, 2024-06-07 to 2026-06-30.
OO4109 arrived on time 65.1% of the time, against 76.2% for all ATL → SBN flights — this specific departure is 11.1 percentage points worse than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 11.1 points worse.
Source: US DOT Bureau of Transportation Statistics · 530 operations between 2024-06-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO4109 | 65.1% | 1.51% | 1 min | 18.5% | 530 |
| SkyWest Airlines on ATL → SBN | 76.2% | 1.11% | -6 min | 11.2% | 3,064 |
| All ATL → SBN flights | 76.2% | 1.11% | -6 min | 11.1% | 3,074 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-30
Other routes OO4109 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 |
|---|---|---|---|
| MSP→MOT Minneapolis to Minot | 2025-09-11 – 2025-12-19 | 89 | — |
| PIT→DTW Pittsburgh to Detroit | 2025-08-11 – 2025-09-10 | 30 | — |
| DTW→GRR Detroit to Grand Rapids | 2025-06-08 – 2025-08-08 | 56 | — |
| DTW→PVD Detroit to Providence/Warwick | 2024-09-09 – 2024-10-06 | 28 | — |
| PVD→DTW Providence/Warwick to Detroit | 2024-09-09 – 2024-10-06 | 28 | — |
| LAX→RNO Los Angeles to Reno | 2023-09-05 – 2024-06-06 | 103 | 93.2% |
| SEA→GEG Seattle to Spokane | 2024-04-09 – 2024-05-06 | 24 | — |
| CMH→MSP Columbus to Minneapolis | 2024-04-13 – 2024-05-04 | 4 | — |
| ORD→JFK Chicago to New York | 2023-10-28 – 2024-04-08 | 99 | 85.1% |
| SMF→LAS Sacramento to Las Vegas | 2023-11-05 – 2023-12-13 | 37 | — |
| MSP→CMH Minneapolis to Columbus | 2023-07-05 – 2023-07-05 | 1 | — |
| MSP→ICT Minneapolis to Wichita | 2023-07-04 – 2023-07-04 | 1 | — |
Because the same number has served different journeys, the statistics above describe only the route OO4109 currently operates. Blending them would produce an average of two different flights.
Why OO4109 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding, fuelling — within the carrier’s control
weather severe enough to stop this flight specifically
airspace and airport capacity, including weather-driven flow control
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for OO4109 on ATL → SBN. 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 530 records of OO4109 operating ATL → SBN, 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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