Flight Reliability
F9 4809 · Frontier Airlines
Atlanta → San Antonio (ATL–SAT)
61
A Little Dicey
WanderNerd Reliability Score
- 69%
- Arrive within 15 minutes
- 26 min
- Average arrival delay
- 2.0%
- Cancelled
- 2 min early
- Median arrival delay
Based on 101 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
F9 4809 departing between 12–3 PM arrived on time 87% of the time, versus 57% between 3–6 PM.
Sunday scaries are real for this one.
F9 4809 arrived on time 78% of the time on Fridays and just 46% on Sundays. That gap is worth planning around.
Lagging the ATL–SAT route.
F9 4809 arrived on time 69% of the time, versus 80% across the ATL–SAT route.
A bit behind the Frontier Airlines network.
F9 4809 arrived on time 69% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon62%(39 flights)
- Tue—(0 flights)
- Wed—(4 flights)
- Thu—(5 flights)
- Fri78%(40 flights)
- Sat—(0 flights)
- Sun46%(11 flights)
- 9 AM–12 PM—(7 flights)
- 12–3 PM87%(31 flights)
- 3–6 PM57%(61 flights)
75%
Feb
Sep 85% → Feb 75% on time
| Month | On-time percentage | Flights |
|---|---|---|
| September 2025 | 85% | 13 |
| October 2025 | 62% | 13 |
| December 2025 | 73% | 11 |
| February 2026 | 75% | 12 |
- Departures on time
- 67%
- Diverted
- 0%
- Flights flown
- 99
- Months covered
- 11
Same route, other flights
Keep nerding
Based on 101 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.