Flight Reliability
UA 4655 · United Airlines
ACV → San Francisco (ACV–SFO)99% of its flights flew this route. The rest (LIT–ORD) are included in these numbers.
63
A Little Dicey
WanderNerd Reliability Score
- 67%
- Arrive within 15 minutes
- 22 min
- Average arrival delay
- 1.4%
- Cancelled
- 0 min
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Skip Wednesday if you can.
UA 4655 arrived on time 73% of the time on Saturdays. On Wednesdays: 62%.
Lagging the United Airlines network.
UA 4655 arrived on time 67% of the time, versus 79% across the United Airlines network.
Recent months have been rougher.
UA 4655 arrived on time 42% of the time over the last three months in the data, compared with 65% in the three months before that.
The breakdown
- Mon63%(51 flights)
- Tue69%(51 flights)
- Wed62%(50 flights)
- Thu64%(52 flights)
- Fri67%(52 flights)
- Sat73%(52 flights)
- Sun69%(52 flights)
- 12–3 PM67%(357 flights)
- 6–9 PM—(3 flights)
36%
May
Jun 87% → May 36% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 87% | 30 |
| July 2025 | 84% | 31 |
| August 2025 | 93% | 29 |
| September 2025 | 73% | 30 |
| October 2025 | 71% | 31 |
| November 2025 | 70% | 30 |
| December 2025 | 62% | 29 |
| January 2026 | 84% | 31 |
| February 2026 | 50% | 28 |
| March 2026 | 60% | 30 |
| April 2026 | 30% | 30 |
| May 2026 | 36% | 31 |
- Departures on time
- 76%
- Diverted
- 0%
- Flights flown
- 360
- 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.