Flight Reliability
F9 2818 · Frontier Airlines
San Diego → Denver (SAN–DEN)
88
Pretty Reliable
WanderNerd Reliability Score
- 84%
- Arrive within 15 minutes
- 6 min
- Average arrival delay
- 0.6%
- Cancelled
- 7 min early
- Median arrival delay
Based on 362 historical flights. Data through May 2026.
What the data says
Saturdays have been rough.
F9 2818 arrived on time 91% of the time on Sundays and just 76% on Saturdays. That gap is worth planning around.
A bit ahead of the SAN–DEN route.
F9 2818 arrived on time 84% of the time, versus 79% across the SAN–DEN route.
Better than the Frontier Airlines network average.
F9 2818 arrived on time 84% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon89%(52 flights)
- Tue80%(51 flights)
- Wed89%(52 flights)
- Thu83%(52 flights)
- Fri82%(50 flights)
- Sat76%(49 flights)
- Sun91%(53 flights)
94%
May
Jun 63% → May 94% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 63% | 30 |
| July 2025 | 84% | 31 |
| August 2025 | 84% | 31 |
| September 2025 | 87% | 30 |
| October 2025 | 87% | 31 |
| November 2025 | 97% | 30 |
| December 2025 | 77% | 30 |
| January 2026 | 86% | 28 |
| February 2026 | 92% | 26 |
| March 2026 | 74% | 31 |
| April 2026 | 87% | 30 |
| May 2026 | 94% | 31 |
- Departures on time
- 86%
- Diverted
- 0.3%
- Flights flown
- 359
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 362 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.