Flight Reliability
UA 1921 · United Airlines
Montrose → Denver (MTJ–DEN)
90
Nerd Approved
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 5 min
- Average arrival delay
- 0%
- Cancelled
- 9 min early
- Median arrival delay
Based on 68 historical flights. Data through May 2026.
What the data says
Tuesdays have been rough.
UA 1921 arrived on time 90% of the time on Wednesdays and just 70% on Tuesdays. That gap is worth planning around.
A bit ahead of the MTJ–DEN route.
UA 1921 arrived on time 82% of the time, versus 78% across the MTJ–DEN route.
A bit ahead of the United Airlines network.
UA 1921 arrived on time 82% of the time, versus 79% across the United Airlines network.
The breakdown
- Mon—(9 flights)
- Tue70%(10 flights)
- Wed90%(10 flights)
- Thu90%(10 flights)
- Fri90%(10 flights)
- Sat80%(10 flights)
- Sun—(9 flights)
80%
Oct
Aug 77% → Oct 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| August 2025 | 77% | 13 |
| September 2025 | 87% | 30 |
| October 2025 | 80% | 25 |
- Departures on time
- 79%
- Diverted
- 0%
- Flights flown
- 68
- Months covered
- 3
Same route, other flights
Keep nerding
Based on 68 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.