Flight Reliability
UA 4721 · United Airlines
PSC → Denver (PSC–DEN)97% of its flights flew this route. The rest (DEN–XWA) are included in these numbers.
89
Pretty Reliable
WanderNerd Reliability Score
- 88%
- Arrive within 15 minutes
- 3 min early
- Average arrival delay
- 0.3%
- Cancelled
- 15 min early
- Median arrival delay
Based on 375 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
UA 4721 departing between 12–3 PM arrived on time 88% of the time, versus 73% between 6–9 PM.
Friday is doing you no favors.
UA 4721 arrived on time 93% of the time on Sundays. On Fridays: 78%.
Better than the United Airlines network average.
UA 4721 arrived on time 88% of the time, versus 79% across the United Airlines network.
It basically never cancels.
Out of 375 scheduled flights, only 0.3% were cancelled.
The breakdown
- Mon92%(51 flights)
- Tue85%(52 flights)
- Wed93%(53 flights)
- Thu83%(52 flights)
- Fri78%(54 flights)
- Sat90%(52 flights)
- Sun93%(55 flights)
- 12–3 PM88%(358 flights)
- 6–9 PM73%(11 flights)
86%
May
Jun 90% → May 86% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 90% | 30 |
| July 2025 | 89% | 27 |
| August 2025 | 87% | 30 |
| September 2025 | 93% | 30 |
| October 2025 | 97% | 31 |
| November 2025 | 100% | 29 |
| December 2025 | 94% | 31 |
| January 2026 | 87% | 31 |
| February 2026 | 79% | 28 |
| March 2026 | 80% | 30 |
| April 2026 | 70% | 30 |
| May 2026 | 86% | 42 |
- Departures on time
- 86%
- Diverted
- 1.3%
- Flights flown
- 369
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 375 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.