Flight Reliability
UA 4671 · United Airlines
San Francisco → BFL (SFO–BFL)92% of its flights flew this route. The rest (ORD–CHA) are included in these numbers.
76
Usually Fine
WanderNerd Reliability Score
- 75%
- Arrive within 15 minutes
- 8 min
- Average arrival delay
- 1.4%
- Cancelled
- 4 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Skip Tuesday if you can.
UA 4671 arrived on time 83% of the time on Wednesdays. On Tuesdays: 71%.
A bit behind the United Airlines network.
UA 4671 arrived on time 75% of the time, versus 79% across the United Airlines network.
Trending in the right direction.
UA 4671 arrived on time 77% of the time over the last three months in the data, compared with 65% in the three months before that.
The breakdown
- Mon74%(50 flights)
- Tue71%(52 flights)
- Wed83%(52 flights)
- Thu80%(51 flights)
- Fri73%(52 flights)
- Sat72%(50 flights)
- Sun73%(52 flights)
77%
May
Jun 80% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 80% | 30 |
| July 2025 | 68% | 31 |
| August 2025 | 84% | 31 |
| September 2025 | 80% | 30 |
| October 2025 | 84% | 31 |
| November 2025 | 80% | 25 |
| December 2025 | 70% | 30 |
| January 2026 | 58% | 31 |
| February 2026 | 68% | 28 |
| March 2026 | 90% | 31 |
| April 2026 | 63% | 30 |
| May 2026 | 77% | 31 |
- Departures on time
- 77%
- Diverted
- 0.3%
- Flights flown
- 359
- 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.