Flight Reliability
UA 5440 · United Airlines
San Francisco → Santa Ana (SFO–SNA)
85
Pretty Reliable
WanderNerd Reliability Score
- 81%
- Arrive within 15 minutes
- 2 min
- Average arrival delay
- 0.6%
- Cancelled
- 8 min early
- Median arrival delay
Based on 360 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
UA 5440 arrived on time 88% of the time on Saturdays. On Sundays: 76%.
Slipping a little lately.
UA 5440 arrived on time 74% of the time over the last three months in the data, compared with 78% in the three months before that.
The breakdown
- Mon78%(51 flights)
- Tue87%(52 flights)
- Wed77%(51 flights)
- Thu80%(50 flights)
- Fri81%(52 flights)
- Sat88%(48 flights)
- Sun76%(53 flights)
60%
May
Jun 83% → May 60% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 83% | 30 |
| July 2025 | 77% | 31 |
| August 2025 | 90% | 31 |
| September 2025 | 93% | 30 |
| October 2025 | 94% | 31 |
| November 2025 | 76% | 29 |
| December 2025 | 74% | 31 |
| January 2026 | 81% | 31 |
| February 2026 | 78% | 27 |
| March 2026 | 89% | 27 |
| April 2026 | 72% | 29 |
| May 2026 | 60% | 30 |
- Departures on time
- 77%
- Diverted
- 0.3%
- Flights flown
- 357
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 360 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.