Flight Reliability
F9 4990 · Frontier Airlines
San Diego → Denver (SAN–DEN)
80
Pretty Reliable
WanderNerd Reliability Score
- 81%
- Arrive within 15 minutes
- 3 min early
- Average arrival delay
- 2.2%
- Cancelled
- 13 min early
- Median arrival delay
Based on 134 historical flights. Data through May 2026.
What the data says
Morning flights do better here.
F9 4990 departing between 9 AM–12 PM arrived on time 96% of the time, versus 63% between 6–9 PM.
Friday is doing you no favors.
F9 4990 arrived on time 100% of the time on Saturdays and just 73% on Fridays. That gap is worth planning around.
Better than the Frontier Airlines network average.
F9 4990 arrived on time 81% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon83%(29 flights)
- Tue—(4 flights)
- Wed—(4 flights)
- Thu76%(21 flights)
- Fri73%(30 flights)
- Sat100%(13 flights)
- Sun77%(30 flights)
- 9 AM–12 PM96%(25 flights)
- 12–3 PM79%(14 flights)
- 3–6 PM92%(12 flights)
- 6–9 PM63%(35 flights)
- 9 PM–12 AM84%(45 flights)
96%
May
Jun 46% → May 96% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 46% | 13 |
| November 2025 | 80% | 15 |
| March 2026 | 88% | 17 |
| April 2026 | 83% | 24 |
| May 2026 | 96% | 23 |
- Departures on time
- 76%
- Diverted
- 0%
- Flights flown
- 131
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 134 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.