Flight Reliability
F9 2551 · Frontier Airlines
Philadelphia → Atlanta (PHL–ATL)
59
A Little Dicey
WanderNerd Reliability Score
- 70%
- Arrive within 15 minutes
- 10 min
- Average arrival delay
- 4.5%
- Cancelled
- 5 min early
- Median arrival delay
Based on 288 historical flights. Data through May 2026.
What the data says
Sunday scaries are real for this one.
F9 2551 arrived on time 86% of the time on Wednesdays and just 65% on Sundays. That gap is worth planning around.
Lagging the PHL–ATL route.
F9 2551 arrived on time 70% of the time, versus 78% across the PHL–ATL route.
Keep a backup plan handy.
F9 2551 was cancelled 4.5% of the time. Typical for U.S. flights is around 1–2%.
Ticking up lately.
F9 2551 arrived on time 67% of the time over the last three months in the data, compared with 61% in the three months before that.
The breakdown
- Mon68%(47 flights)
- Tue65%(23 flights)
- Wed86%(22 flights)
- Thu76%(46 flights)
- Fri71%(49 flights)
- Sat66%(41 flights)
- Sun65%(46 flights)
- 3–6 AM70%(224 flights)
- 6–9 AM71%(42 flights)
- 9 AM–12 PM—(6 flights)
- 12–3 PM—(2 flights)
70%
May
Jun 75% → May 70% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 75% | 24 |
| July 2025 | 84% | 19 |
| August 2025 | 65% | 20 |
| September 2025 | 77% | 17 |
| October 2025 | 93% | 28 |
| November 2025 | 62% | 21 |
| December 2025 | 53% | 19 |
| January 2026 | 73% | 26 |
| February 2026 | 57% | 21 |
| March 2026 | 65% | 26 |
| April 2026 | 65% | 23 |
| May 2026 | 70% | 30 |
- Departures on time
- 86%
- Diverted
- 0.3%
- Flights flown
- 274
- Months covered
- 12
Same route, other flights
Keep nerding
Based on 288 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.