Flight Reliability
F9 4385 · Frontier Airlines
Cedar Rapids → Denver (CID–DEN)
79
Usually Fine
WanderNerd Reliability Score
- 76%
- Arrive within 15 minutes
- 7 min
- Average arrival delay
- 1.2%
- Cancelled
- 10 min early
- Median arrival delay
Based on 168 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
F9 4385 departing between 12–3 PM arrived on time 96% of the time, versus 70% between 3–6 PM.
Tuesdays have been rough.
F9 4385 arrived on time 88% of the time on Sundays and just 62% on Tuesdays. That gap is worth planning around.
Trending in the right direction.
F9 4385 arrived on time 93% of the time over the last three months in the data, compared with 78% in the three months before that.
The breakdown
- Mon75%(28 flights)
- Tue62%(13 flights)
- Wed—(2 flights)
- Thu63%(40 flights)
- Fri84%(25 flights)
- Sat80%(15 flights)
- Sun88%(43 flights)
- 12–3 PM96%(26 flights)
- 3–6 PM70%(10 flights)
- 6–9 PM72%(130 flights)
100%
May
Jun 60% → May 100% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 60% | 15 |
| July 2025 | 50% | 18 |
| August 2025 | 65% | 17 |
| September 2025 | 82% | 17 |
| October 2025 | 72% | 18 |
| November 2025 | 89% | 18 |
| December 2025 | 73% | 11 |
| March 2026 | 88% | 16 |
| April 2026 | 90% | 10 |
| May 2026 | 100% | 12 |
- Departures on time
- 75%
- Diverted
- 0%
- Flights flown
- 166
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 168 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.