Flight Reliability
F9 4917 · Frontier Airlines
Denver → San Jose (DEN–SJC)
91
Nerd Approved
WanderNerd Reliability Score
- 83%
- Arrive within 15 minutes
- 2 min early
- Average arrival delay
- 0%
- Cancelled
- 8 min early
- Median arrival delay
Based on 63 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
F9 4917 arrived on time 100% of the time on Mondays and just 74% on Sundays. That gap is worth planning around.
Better than the DEN–SJC route average.
F9 4917 arrived on time 83% of the time, versus 75% across the DEN–SJC route.
Better than the Frontier Airlines network average.
F9 4917 arrived on time 83% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon100%(13 flights)
- Tue—(0 flights)
- Wed—(0 flights)
- Thu78%(18 flights)
- Fri85%(13 flights)
- Sat—(0 flights)
- Sun74%(19 flights)
67%
Oct
Aug 83% → Oct 67% on time
| Month | On-time percentage | Flights |
|---|---|---|
| August 2025 | 83% | 12 |
| September 2025 | 88% | 17 |
| October 2025 | 67% | 12 |
- Departures on time
- 87%
- Diverted
- 0%
- Flights flown
- 63
- Months covered
- 6
Same route, other flights
Keep nerding
Based on 63 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.