Flight Reliability
UA 5421 · United Airlines
Denver → LBB (DEN–LBB)
76
Usually Fine
WanderNerd Reliability Score
- 75%
- Arrive within 15 minutes
- 16 min
- Average arrival delay
- 0.5%
- 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 5421 arrived on time 83% of the time on Tuesdays and just 67% on Sundays. That gap is worth planning around.
A bit ahead of the DEN–LBB route.
UA 5421 arrived on time 75% of the time, versus 72% across the DEN–LBB route.
A bit behind the United Airlines network.
UA 5421 arrived on time 75% of the time, versus 79% across the United Airlines network.
Trending in the right direction.
UA 5421 arrived on time 77% of the time over the last three months in the data, compared with 67% in the three months before that.
The breakdown
- Mon73%(52 flights)
- Tue83%(52 flights)
- Wed77%(52 flights)
- Thu83%(52 flights)
- Fri72%(50 flights)
- Sat73%(51 flights)
- Sun67%(52 flights)
77%
May
Jun 69% → May 77% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 69% | 29 |
| July 2025 | 68% | 31 |
| August 2025 | 61% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 97% | 31 |
| November 2025 | 90% | 30 |
| December 2025 | 68% | 31 |
| January 2026 | 68% | 28 |
| February 2026 | 64% | 28 |
| March 2026 | 81% | 31 |
| April 2026 | 73% | 30 |
| May 2026 | 77% | 31 |
- Departures on time
- 77%
- Diverted
- 0.5%
- Flights flown
- 361
- 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.