ACK to PHL flight delays & on-time performance
Nonstop flights from Nantucket Memorial Airport to Philadelphia International Airport · 288 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ACK or PHL right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Nantucket (ACK) to Philadelphia (PHL) arrived on time 72% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 4.1% were cancelled, and 13% arrived an hour or more late.
- Republic Airways is the only airline reporting nonstop flights on this route.
- Departures scheduled around 12pm did best (93% on time); around 4pm did worst (49%).
- Wednesday was the most reliable day to fly (93% on time) and Monday the least (59%).
- The largest source of delay minutes was air traffic control & airport congestion (49%).
Which airline is most on time from ACK to PHL?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Republic AirwaysRegional airline operating flights for American Eagle, Delta Connection and United Express. | 72% | 4.1% | 24 min | 12.8% | 122 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 12pm93%41 flights
- 3pm76%40 flights
- 4pm49%37 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday59%0.0% cancelled
- Tuesday79%17.6% cancelled
- Wednesday93%6.3% cancelled
- Thursday61%0.0% cancelled
- Friday74%0.0% cancelled
- Saturday63%5.9% cancelled
- Sunday78%0.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Air traffic control & airport congestion49%
- Late-arriving aircraft48%
- Airline (crew, maintenance, cleaning, fueling)3%
- Security0%
- Extreme weather0%
Why flights are cancelled
Share of cancellations by reason.
- Air traffic control & airport congestion60%
- Extreme weather40%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
ACK to PHL: common questions
- How often are ACK to PHL flights on time?
- 72% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Nantucket to Philadelphia cancelled?
- 4.1% of scheduled flights were cancelled (5 of 122).
- How long are typical delays?
- Across all flights the average arrival delay was 24 min (early arrivals count as zero). Flights that were late arrived 85 min behind schedule on average, and 12.8% of flights were an hour or more late.
- How long is taxi time at ACK?
- Flights on this route spent 27 min taxiing from the gate to takeoff on average.
Related routes
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ACK → PHL, nonstop flights by US airlines that report to the DOT. How we calculate this.