Flight Reliability
F9 2857 · Frontier Airlines
Los Angeles → San Francisco (LAX–SFO)
37
Bring Snacks
WanderNerd Reliability Score
- 50%
- Arrive within 15 minutes
- 29 min
- Average arrival delay
- 2.9%
- Cancelled
- 14 min
- Median arrival delay
Based on 204 historical flights. Data through May 2026.
What the data says
The 3–6 PM departure wins.
F9 2857 departing between 3–6 PM arrived on time 62% of the time, versus 44% between 6–9 PM.
Sunday scaries are real for this one.
F9 2857 arrived on time 62% of the time on Tuesdays and just 39% on Sundays. That gap is worth planning around.
Well behind the LAX–SFO route.
F9 2857 arrived on time 50% of the time, versus 69% across the LAX–SFO route.
Well behind the Frontier Airlines network.
F9 2857 arrived on time 50% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon48%(31 flights)
- Tue62%(21 flights)
- Wed57%(23 flights)
- Thu50%(30 flights)
- Fri43%(35 flights)
- Sat60%(25 flights)
- Sun39%(33 flights)
- 3–6 PM62%(37 flights)
- 6–9 PM44%(153 flights)
- 9 PM–12 AM—(8 flights)
38%
May
Sep 60% → May 38% on time
| Month | On-time percentage | Flights |
|---|---|---|
| September 2025 | 60% | 10 |
| October 2025 | 50% | 20 |
| November 2025 | 40% | 30 |
| December 2025 | 60% | 30 |
| January 2026 | 70% | 20 |
| February 2026 | 75% | 16 |
| March 2026 | 69% | 26 |
| April 2026 | 10% | 30 |
| May 2026 | 38% | 16 |
- Departures on time
- 57%
- Diverted
- 0%
- Flights flown
- 198
- Months covered
- 9
Same route, other flights
Keep nerding
Based on 204 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.