Flight Reliability
UA 1588 · United Airlines
Denver → RDM (DEN–RDM)80% of its flights flew this route. The rest (MSY–DEN, PNS–DEN) are included in these numbers.
77
Usually Fine
WanderNerd Reliability Score
- 77%
- Arrive within 15 minutes
- 9 min
- Average arrival delay
- 0.7%
- Cancelled
- 3 min early
- Median arrival delay
Based on 453 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
UA 1588 departing between 12–3 PM arrived on time 100% of the time, versus 73% between 6–9 PM.
Thursdays have been rough.
UA 1588 arrived on time 85% of the time on Mondays and just 67% on Thursdays. That gap is worth planning around.
Trending in the right direction.
UA 1588 arrived on time 86% of the time over the last three months in the data, compared with 79% in the three months before that.
The breakdown
- Mon85%(65 flights)
- Tue80%(64 flights)
- Wed82%(65 flights)
- Thu67%(61 flights)
- Fri73%(64 flights)
- Sat78%(63 flights)
- Sun71%(63 flights)
- 12–3 PM100%(29 flights)
- 3–6 PM90%(60 flights)
- 6–9 PM73%(356 flights)
80%
May
Jun 57% → May 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 57% | 30 |
| July 2025 | 43% | 30 |
| August 2025 | 48% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 76% | 37 |
| November 2025 | 90% | 57 |
| December 2025 | 69% | 32 |
| January 2026 | 83% | 29 |
| February 2026 | 84% | 25 |
| March 2026 | 85% | 33 |
| April 2026 | 92% | 60 |
| May 2026 | 80% | 51 |
- Departures on time
- 73%
- Diverted
- 1.1%
- Flights flown
- 445
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 453 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.