Flight Reliability
F9 4567 · Frontier Airlines
St. Louis → Denver (STL–DEN)
80
Pretty Reliable
WanderNerd Reliability Score
- 76%
- Arrive within 15 minutes
- 12 min
- Average arrival delay
- 0.8%
- Cancelled
- 7 min early
- Median arrival delay
Based on 242 historical flights. Data through May 2026.
What the data says
Friday is doing you no favors.
F9 4567 arrived on time 100% of the time on Sundays and just 60% on Fridays. That gap is worth planning around.
The breakdown
- Mon71%(45 flights)
- Tue94%(16 flights)
- Wed76%(42 flights)
- Thu82%(22 flights)
- Fri60%(48 flights)
- Sat76%(45 flights)
- Sun100%(22 flights)
- 3–6 PM—(4 flights)
- 6–9 PM76%(236 flights)
80%
May
Jun 53% → May 80% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 53% | 17 |
| July 2025 | 44% | 16 |
| August 2025 | 75% | 24 |
| September 2025 | 83% | 30 |
| October 2025 | 87% | 31 |
| November 2025 | 93% | 29 |
| December 2025 | 67% | 18 |
| January 2026 | 73% | 11 |
| March 2026 | 56% | 16 |
| April 2026 | 90% | 19 |
| May 2026 | 80% | 25 |
- Departures on time
- 76%
- Diverted
- 0%
- Flights flown
- 240
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 242 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.