Flight Reliability
F9 2356 · Frontier Airlines
Denver → San Antonio (DEN–SAT)
92
Nerd Approved
WanderNerd Reliability Score
- 84%
- Arrive within 15 minutes
- 1 min early
- Average arrival delay
- 0%
- Cancelled
- 7 min early
- Median arrival delay
Based on 121 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
F9 2356 departing between 12–3 PM arrived on time 92% of the time, versus 80% between 9 AM–12 PM.
Mondays have been rough.
F9 2356 arrived on time 100% of the time on Thursdays and just 67% on Mondays. That gap is worth planning around.
A bit ahead of the DEN–SAT route.
F9 2356 arrived on time 84% of the time, versus 77% across the DEN–SAT route.
Better than the Frontier Airlines network average.
F9 2356 arrived on time 84% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon67%(12 flights)
- Tue88%(16 flights)
- Wed75%(16 flights)
- Thu100%(16 flights)
- Fri88%(17 flights)
- Sat78%(23 flights)
- Sun86%(21 flights)
- 6–9 AM85%(41 flights)
- 9 AM–12 PM80%(30 flights)
- 12–3 PM92%(12 flights)
- 3–6 PM82%(38 flights)
85%
May
Sep 73% → May 85% on time
| Month | On-time percentage | Flights |
|---|---|---|
| September 2025 | 73% | 11 |
| October 2025 | 92% | 13 |
| November 2025 | 88% | 25 |
| December 2025 | 84% | 19 |
| January 2026 | 80% | 15 |
| May 2026 | 85% | 27 |
- Departures on time
- 83%
- Diverted
- 0%
- Flights flown
- 121
- Months covered
- 10
Same route, other flights
Keep nerding
Based on 121 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.