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Route on-time record

JFK to ACK: most on-time flights and the best time to fly

New York (John F. Kennedy International Airport) to Nantucket (Nantucket Memorial Airport). 311 nonstop flights in Jun 2025 to May 2026, 84% arrived within 15 minutes and 3.2% were cancelled. The most reliable flight number was Republic 5804 at 12:59 PM.

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JFK → ACK

New York to Nantucket: 311 nonstop flights a year

On time (12 months)

84%

Cancelled

3.2%

avg delay 11 min

Best time to leave

9 AM to noon

88% on time vs 81% noon to 3 PM

Most reliable airline

Republic

83% chance on time

Check JFK to ACK fares

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. #1 · Republic 5804 · sold as American Eagle, Delta Connection or United Express

    12:59 PM → 2:19 PM1h 20m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    83%

    chance on time

    On time (history)
    86%
    Cancelled
    2.9%
    Avg arrival delay
    11 min
    • Arrived on time 86% of the time (100 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (Noon to 3 PM: 81% on time; 9 AM to noon: 88%).
    • Departs outside JFK's trouble window (1 PM to 7 PM, when 66% of its 168 ground stops and delay programs started).

    Moderate track record · 100 flights

    Find 12:59 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)83%

    110 flights · 87% on time as flown · 3.0% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • 9 AM to noon88%

    113 flights · avg delay 9 min

  • Noon to 3 PM81%

    198 flights · avg delay 13 min

Best day: Wednesday (83%). Worst: Sunday (70%).

Smarter routing

Nearby airports that run more on time

  • LGA → MVY 87% chance on time

    LaGuardia Airport to Martha's Vineyard Airport · 318 flights a year · 41 mi from your airports · yours: 81%

    Rank flightsFares

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.

J
-
F
-
M
-
A
-
M
79
J
80
J
76
A
81
S
78
O
76
N
-
D
-

What delays this route

  • Late-arriving aircraft41%
  • Airline (crew, maintenance, boarding)32%
  • Air traffic control and airport volume23%
  • 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

Finding the most reliable connections from JFK to ACK…

JFK to ACK questions

What time of day is best to fly JFK to ACK?
9 AM to noon: 88% of flights arrived on time, against 81% for departures noon to 3 PM.
Which airline is most on time from JFK to ACK?
Republic, with a season-adjusted 83% 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 JFK to ACK?
July (76% on time); the best was August (81%), 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.

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Live status: FAA delays and ground stops