Flight Reliability
UA 1638 · United Airlines
Denver → Los Angeles (DEN–LAX)
100
Nerd Approved
WanderNerd Reliability Score
- 93%
- Arrive within 15 minutes
- 5 min early
- Average arrival delay
- 0%
- Cancelled
- 7 min early
- Median arrival delay
Based on 365 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
UA 1638 arrived on time 98% of the time on Tuesdays. On Sundays: 85%.
Better than the DEN–LAX route average.
UA 1638 arrived on time 93% of the time, versus 80% across the DEN–LAX route.
Better than the United Airlines network average.
UA 1638 arrived on time 93% of the time, versus 79% across the United Airlines network.
It basically never cancels.
Out of 365 scheduled flights, only 0.0% were cancelled.
The breakdown
- Mon89%(52 flights)
- Tue98%(52 flights)
- Wed96%(52 flights)
- Thu98%(52 flights)
- Fri94%(52 flights)
- Sat92%(52 flights)
- Sun85%(53 flights)
94%
May
Jun 100% → May 94% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 100% | 30 |
| July 2025 | 94% | 31 |
| August 2025 | 90% | 31 |
| September 2025 | 90% | 30 |
| October 2025 | 97% | 31 |
| November 2025 | 93% | 30 |
| December 2025 | 87% | 31 |
| January 2026 | 94% | 31 |
| February 2026 | 93% | 28 |
| March 2026 | 87% | 31 |
| April 2026 | 100% | 30 |
| May 2026 | 94% | 31 |
- Departures on time
- 96%
- Diverted
- 0%
- Flights flown
- 365
- 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.