Flight Reliability
UA 4253 · United Airlines
Washington → SCE (IAD–SCE)
88
Pretty Reliable
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 0.5%
- Cancelled
- 6 min early
- Median arrival delay
Based on 364 historical flights. Data through May 2026.
What the data says
Skip Tuesday if you can.
UA 4253 arrived on time 90% of the time on Saturdays. On Tuesdays: 77%.
A bit ahead of the United Airlines network.
UA 4253 arrived on time 83% of the time, versus 79% across the United Airlines network.
The breakdown
- Mon79%(52 flights)
- Tue77%(52 flights)
- Wed90%(51 flights)
- Thu85%(52 flights)
- Fri82%(51 flights)
- Sat90%(52 flights)
- Sun80%(51 flights)
80%
May
Jun 63% → May 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 63% | 30 |
| July 2025 | 68% | 31 |
| August 2025 | 90% | 31 |
| September 2025 | 97% | 30 |
| October 2025 | 97% | 31 |
| November 2025 | 79% | 29 |
| December 2025 | 87% | 30 |
| January 2026 | 77% | 30 |
| February 2026 | 86% | 28 |
| March 2026 | 84% | 31 |
| April 2026 | 93% | 30 |
| May 2026 | 80% | 30 |
- Departures on time
- 85%
- Diverted
- 0.3%
- Flights flown
- 361
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 364 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.