Flight Reliability
F9 1237 · Frontier Airlines
ISP → Orlando (ISP–MCO)
16
Bring Snacks
WanderNerd Reliability Score
- 52%
- Arrive within 15 minutes
- 42 min
- Average arrival delay
- 5.5%
- Cancelled
- 14 min
- Median arrival delay
Based on 127 historical flights. Data through May 2026.
What the data says
The 12–3 PM departure wins.
F9 1237 departing between 12–3 PM arrived on time 100% of the time, versus 39% between 6–9 PM.
Sunday scaries are real for this one.
F9 1237 arrived on time 67% of the time on Mondays and just 20% on Sundays. That gap is worth planning around.
Well behind the ISP–MCO route.
F9 1237 arrived on time 52% of the time, versus 73% across the ISP–MCO route.
Well behind the Frontier Airlines network.
F9 1237 arrived on time 52% of the time, versus 73% across the Frontier Airlines network.
The breakdown
- Mon67%(21 flights)
- Tue—(7 flights)
- Wed54%(13 flights)
- Thu59%(17 flights)
- Fri58%(26 flights)
- Sat43%(14 flights)
- Sun20%(20 flights)
- 6–9 AM—(2 flights)
- 12–3 PM100%(10 flights)
- 3–6 PM60%(15 flights)
- 6–9 PM39%(80 flights)
- 9 PM–12 AM82%(11 flights)
69%
Mar
Jun 38% → Mar 69% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 38% | 24 |
| July 2025 | 37% | 19 |
| August 2025 | 18% | 17 |
| March 2026 | 69% | 16 |
- Departures on time
- 50%
- Diverted
- 1.6%
- Flights flown
- 118
- Months covered
- 11
Same route, other flights
Keep nerding
Based on 127 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.