Flight Reliability
F9 4186 · Frontier Airlines
Denver → Detroit (DEN–DTW)
79
Usually Fine
WanderNerd Reliability Score
- 75%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 1.0%
- Cancelled
- 9 min early
- Median arrival delay
Based on 105 historical flights. Data through May 2026.
What the data says
3–6 PM has a slight edge.
Departures between 3–6 PM arrived on time 78% of the time, against 73% between 6–9 PM.
Saturdays have been rough.
F9 4186 arrived on time 86% of the time on Mondays and just 65% on Saturdays. That gap is worth planning around.
The breakdown
- Mon86%(14 flights)
- Tue82%(11 flights)
- Wed—(9 flights)
- Thu83%(18 flights)
- Fri69%(16 flights)
- Sat65%(17 flights)
- Sun68%(19 flights)
- 3–6 PM78%(37 flights)
- 6–9 PM73%(67 flights)
53%
May
Nov 82% → May 53% on time
| Month | On-time percentage | Flights |
|---|---|---|
| November 2025 | 82% | 11 |
| February 2026 | 90% | 19 |
| March 2026 | 78% | 18 |
| May 2026 | 53% | 30 |
- Departures on time
- 75%
- Diverted
- 0%
- Flights flown
- 104
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 105 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.