Flight Reliability
F9 3549 · Frontier Airlines
Phoenix → San Francisco (PHX–SFO)
90
Nerd Approved
WanderNerd Reliability Score
- 82%
- Arrive within 15 minutes
- 1 min
- Average arrival delay
- 0%
- Cancelled
- 13 min early
- Median arrival delay
Based on 74 historical flights. Data through May 2026.
What the data says
Mornings have a slight edge.
Departures between 6–9 AM arrived on time 85% of the time, against 81% between 3–6 PM.
Sunday scaries are real for this one.
F9 3549 arrived on time 100% of the time on Fridays and just 67% on Sundays. That gap is worth planning around.
Better than the PHX–SFO route average.
F9 3549 arrived on time 82% of the time, versus 72% across the PHX–SFO route.
Better than the Frontier Airlines network average.
F9 3549 arrived on time 82% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon85%(13 flights)
- Tue—(5 flights)
- Wed—(5 flights)
- Thu87%(15 flights)
- Fri100%(12 flights)
- Sat75%(12 flights)
- Sun67%(12 flights)
- 3–6 AM—(2 flights)
- 6–9 AM85%(13 flights)
- 3–6 PM81%(59 flights)
91%
Mar
Oct 81% → Mar 91% on time
| Month | On-time percentage | Flights |
|---|---|---|
| October 2025 | 81% | 16 |
| November 2025 | 77% | 26 |
| February 2026 | 85% | 13 |
| March 2026 | 91% | 11 |
- Departures on time
- 78%
- Diverted
- 0%
- Flights flown
- 74
- Months covered
- 7
Same route, other flights
Keep nerding
Based on 74 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.