Flight Reliability
F9 4918 · Frontier Airlines
San Jose → Denver (SJC–DEN)
87
Pretty Reliable
WanderNerd Reliability Score
- 79%
- Arrive within 15 minutes
- 2 min early
- Average arrival delay
- 0%
- Cancelled
- 13 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 4918 arrived on time 92% of the time on Mondays and just 68% on Sundays. That gap is worth planning around.
A bit ahead of the Frontier Airlines network.
F9 4918 arrived on time 79% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon92%(13 flights)
- Tue—(0 flights)
- Wed—(0 flights)
- Thu72%(18 flights)
- Fri92%(13 flights)
- Sat—(0 flights)
- Sun68%(19 flights)
92%
Oct
Aug 92% → Oct 92% on time
| Month | On-time percentage | Flights |
|---|---|---|
| August 2025 | 92% | 12 |
| September 2025 | 77% | 17 |
| October 2025 | 92% | 12 |
- Departures on time
- 81%
- 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.