Flight Reliability
UA 4683 · United Airlines
Tucson → San Francisco (TUS–SFO)91% of its flights flew this route. The rest (SFO–SMF, LIT–IAH) are included in these numbers.
- 78%
- Arrive within 15 minutes
- 10 min
- Average arrival delay
- 0%
- Cancelled
- 1 min
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
UA 4683 departing between 12–3 PM arrived on time 84% of the time, versus 25% between 9 AM–12 PM.
Thursday is the weak spot.
UA 4683 arrived on time 83% of the time on Saturdays. On Thursdays: 75%.
It basically never cancels.
Out of 365 scheduled flights, only 0.0% were cancelled.
Recent months have been rougher.
UA 4683 arrived on time 46% of the time over the last three months in the data, compared with 84% in the three months before that.
The breakdown
- Mon79%(52 flights)
- Tue79%(52 flights)
- Wed77%(52 flights)
- Thu75%(51 flights)
- Fri75%(52 flights)
- Sat83%(52 flights)
- Sun76%(53 flights)
- 6–9 AM79%(321 flights)
- 9 AM–12 PM25%(12 flights)
- 12–3 PM84%(31 flights)
Jun 90% → May 16% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 90% | 30 |
| July 2025 | 81% | 31 |
| August 2025 | 94% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 90% | 31 |
| November 2025 | 97% | 30 |
| December 2025 | 84% | 31 |
| January 2026 | 90% | 31 |
| February 2026 | 78% | 27 |
| March 2026 | 87% | 31 |
| April 2026 | 33% | 30 |
| May 2026 | 16% | 31 |
- Departures on time
- 82%
- Diverted
- 0.3%
- Flights flown
- 364
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 365 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.