Flight profile · SkyWest Airlines
OO3991
Seattle (SEA) to San Francisco (SFO) · scheduled 5:50 PM – 8:11 PM
How OO3991 performs
407 operations, 2024-06-07 to 2026-06-30.
OO3991 arrived on time 67.2% of the time, against 69.9% for all SEA → SFO flights — this specific departure is 2.7 percentage points worse than the route as a whole. Against SkyWest Airlines’s own flights on this route it is 5.7 points worse.
Source: US DOT Bureau of Transportation Statistics · 407 operations between 2024-06-07 to 2026-06-30
Against the rest of the route
| On time | Cancelled | Median delay | Severe | Flights | |
|---|---|---|---|---|---|
| OO3991 | 67.2% | 0.49% | 2 min | 6.4% | 407 |
| SkyWest Airlines on SEA → SFO | 72.8% | 0.43% | -1 min | 8.0% | 3,288 |
| All SEA → SFO flights | 69.9% | 1.02% | 0 min | 8.9% | 20,106 |
Source: FlyerIntel analysis of US DOT BTS data · 2024-06-07 to 2026-06-30
Other routes OO3991 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 |
|---|---|---|---|
| SFO→SEA San Francisco to Seattle | 2025-06-08 – 2026-06-30 | 315 | 72.2% |
| RAP→MSP Rapid City to Minneapolis | 2023-12-16 – 2026-03-07 | 265 | 89.7% |
| OMA→MSP Omaha to Minneapolis | 2024-12-19 – 2026-01-04 | 34 | — |
| LGA→SYR New York to Syracuse | 2025-03-10 – 2025-04-11 | 25 | — |
| SYR→LGA Syracuse to New York | 2025-03-10 – 2025-04-11 | 25 | — |
| ATL→FAY Atlanta to Fayetteville | 2025-01-07 – 2025-01-16 | 7 | — |
| FAY→ATL Fayetteville to Atlanta | 2025-01-07 – 2025-01-16 | 7 | — |
| SHV→ATL Shreveport to Atlanta | 2024-12-02 – 2024-12-18 | 17 | — |
| OKC→ATL Oklahoma City to Atlanta | 2024-12-01 – 2024-12-01 | 1 | — |
| DTW→RIC Detroit to Richmond | 2024-09-09 – 2024-10-06 | 28 | — |
| SEA→SNA Seattle to Santa Ana | 2024-08-06 – 2024-08-13 | 2 | — |
| SNA→SEA Santa Ana to Seattle | 2024-08-06 – 2024-08-13 | 2 | — |
| LAX→OAK Los Angeles to Oakland | 2023-11-05 – 2023-12-15 | 27 | — |
| OAK→LAX Oakland to Los Angeles | 2023-11-05 – 2023-12-15 | 27 | — |
| SLC→ONT Salt Lake City to Ontario | 2023-10-09 – 2023-10-27 | 17 | — |
| ATL→BMI Atlanta to Bloomington/Normal | 2023-10-08 – 2023-10-08 | 1 | — |
| OMA→LGA Omaha to New York | 2023-09-18 – 2023-10-06 | 15 | — |
| JFK→ORD New York to Chicago | 2023-09-05 – 2023-09-15 | 11 | — |
| SEA→BOI Seattle to Boise | 2023-07-01 – 2023-09-04 | 66 | — |
| BOI→SEA Boise to Seattle | 2023-07-01 – 2023-07-09 | 9 | — |
Because the same number has served different journeys, the statistics above describe only the route OO3991 currently operates. Blending them would produce an average of two different flights.
Data and methodology
Calculated by FlyerIntel from 407 records of OO3991 operating SEA → SFO, 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.