Nantucket (ACK) to Philadelphia (PHL): On-Time Performance
Data through July 2026
Nantucket (ACK) to Philadelphia (PHL) is a thinner route than most in this dataset — 122 departures over the past year, roughly 2 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 67% arrived on time, noticeably below the national average of 78%. Cancellations are the bigger caveat: 8.9% of scheduled flights never departed.
- On-time
- 67%
- arrived <15 min late
- Avg delay
- 28 min
- completed flights
- Cancelled
- 8.9%
- Flights/day
- 0.33
- last 12 months
- Duration
- 1h 38m
- scheduled
- Distance
- 288 mi
Monthly on-time trend
Best time to fly from ACK to PHL
Aim for departures around 12 p.m. (91% on-time); avoid 4 p.m. departures (51%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 58% | 67 min |
| Tuesday | 74% | 16 min |
| Wednesdaybest | 78% | 12 min |
| Thursday | 61% | 29 min |
| Friday | 69% | 16 min |
| Saturday | 55% | 38 min |
| Sunday | 75% | 15 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft32%
- Airline operations2%
- National airspace system66%
Frequently asked questions
- How often are flights from ACK to PHL delayed?
- 33% of ACK–PHL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 28 minutes.
- What is the best time of day to fly from ACK to PHL?
- Departures around 12 p.m. have the best record (91% on-time), while departures around 4 p.m. have the worst (51%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ACK to PHL?
- The scheduled ACK–PHL flight time averages 1h 38m over 288 miles. Actual arrival times vary — flights on this route land 15+ minutes late 33% of the time.
- How often are ACK to PHL flights cancelled?
- 8.9% of scheduled flights on this route were cancelled between 2024-07 and 2026-07 — several times the typical US rate, so consider earlier departures or backup options.
- What day of the week is most reliable for ACK to PHL?
- Wednesday flights have the best record at 78% on-time. Day-of-week differences on this route are meaningful — Saturday trails at 55%.
Explore related pages
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Related guides
Based on 236 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.