Flight Reliability
UA 5999 · United Airlines
Chicago → Oklahoma City (ORD–OKC)87% of its flights flew this route. The rest (PIA–ORD) are included in these numbers.
- 78%
- Arrive within 15 minutes
- 16 min
- Average arrival delay
- 1.3%
- Cancelled
- 6 min early
- Median arrival delay
Based on 231 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
UA 5999 departing between 12–3 PM arrived on time 81% of the time, versus 59% between 9 AM–12 PM.
Sunday scaries are real for this one.
UA 5999 arrived on time 90% of the time on Fridays and just 71% on Sundays. That gap is worth planning around.
Better than the ORD–OKC route average.
UA 5999 arrived on time 78% of the time, versus 69% across the ORD–OKC route.
Recent months have been rougher.
UA 5999 arrived on time 75% of the time over the last three months in the data, compared with 84% in the three months before that.
The breakdown
- Mon75%(40 flights)
- Tue75%(28 flights)
- Wed85%(27 flights)
- Thu73%(37 flights)
- Fri90%(39 flights)
- Sat79%(19 flights)
- Sun71%(38 flights)
- 9 AM–12 PM59%(27 flights)
- 12–3 PM81%(201 flights)
Jun 67% → May 88% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 67% | 18 |
| July 2025 | 77% | 17 |
| August 2025 | 81% | 21 |
| September 2025 | 85% | 27 |
| October 2025 | 87% | 31 |
| November 2025 | 79% | 28 |
| December 2025 | 79% | 28 |
| April 2026 | 57% | 28 |
| May 2026 | 88% | 25 |
- Departures on time
- 79%
- Diverted
- 0%
- Flights flown
- 228
- Months covered
- 10
Same route, other flights
Keep nerding
Based on 231 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.