Route on-time record
ACK to JFK: most on-time flights and the best time to fly
Nantucket (Nantucket Memorial Airport) to New York (John F. Kennedy International Airport). 311 nonstop flights in Jun 2025 to May 2026, 66% arrived within 15 minutes and 4.8% were cancelled. The most reliable flight number was Republic 5804 at 3:00 PM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
ACK → JFK
Nantucket to New York: 311 nonstop flights a year
On time (12 months)
66%
Cancelled
4.8%
avg delay 33 min
Best time to leave
Noon to 3 PM
72% on time vs 64% 3 to 6 PM
Most reliable airline
Republic
59% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Republic 5804 · sold as American Eagle, Delta Connection or United Express
3:00 PM → 4:16 PM1h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
56%
chance on time
- On time (history)
- 59%
- Cancelled
- 7.8%
- Avg arrival delay
- 31 min
- Arrived on time 59% of the time (95 flights, Jun 2025 to May 2026).
- Cancelled 7.8% of the time (8 of 103).
- Leaves in this route's least on-time window (3 to 6 PM: 64% on time; Noon to 3 PM: 72%).
- Lands inside JFK's trouble window: 66% of its 168 ground stops and delay programs started between 1 PM and 7 PM.
Moderate track record · 95 flights
Find 3:00 PM flight fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Republic Airways (sold as American Eagle, Delta Connection or United Express)59%
110 flights · 61% on time as flown · 5.9% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Noon to 3 PM72%
90 flights · avg delay 40 min
- 3 to 6 PM64%
221 flights · avg delay 30 min
Best day: Tuesday (75%). Worst: Sunday (63%).
Smarter routing
Nearby airports that run more on time
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Air traffic control and airport volume49%
- Airline (crew, maintenance, boarding)31%
- Late-arriving aircraft17%
- Severe weather3%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
ACK to JFK questions
- What time of day is best to fly ACK to JFK?
- Noon to 3 PM: 72% of flights arrived on time, against 64% for departures 3 to 6 PM.
- Which airline is most on time from ACK to JFK?
- Republic, with a season-adjusted 59% chance of operating and arriving on time over 110 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on ACK to JFK?
- July (61% on time); the best was October (79%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from ACK
Live status: FAA delays and ground stops