Route on-time record
LGA to ACK: most on-time flights and the best time to fly
New York (LaGuardia Airport) to Nantucket (Nantucket Memorial Airport). 409 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 2.0% were cancelled. The most reliable flight number was Republic 5856 at 10:09 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
LGA → ACK
New York to Nantucket: 409 nonstop flights a year
On time (12 months)
82%
Cancelled
2.0%
avg delay 11 min
Best time to leave
9 AM to noon
88% on time vs 79% noon to 3 PM
Most reliable airline
Republic
81% 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 5856 · sold as American Eagle, Delta Connection or United Express
10:09 AM → 11:27 AM1h 18m nonstop
Local times, typical schedule. Last flown 2026-05-31.
87%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.9%
- Avg arrival delay
- 9 min
- Arrived on time 89% of the time (107 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 88% on time; Noon to 3 PM: 79%).
- Departs outside LGA's trouble window (noon to 6 PM, when 55% of its 284 ground stops and delay programs started).
Moderate track record · 107 flights
Find 10:09 AM flight fares Opens this date on Aviasales#2 · Republic 5737 · sold as American Eagle, Delta Connection or United Express
2:04 PM → 3:20 PM1h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 77%
- Cancelled
- 2.9%
- Avg arrival delay
- 11 min
- Arrived on time 77% of the time (100 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (Noon to 3 PM: 79% on time; 9 AM to noon: 88%).
- Departs inside LGA's trouble window: 55% of its 284 ground stops and delay programs started between noon and 6 PM.
Moderate track record · 100 flights
Find 2:04 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)81%
310 flights · 83% on time as flown · 1.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon88%
173 flights · avg delay 8 min
- Noon to 3 PM79%
222 flights · avg delay 12 min
Best day: Tuesday (87%). Worst: Saturday (78%).
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 · 30 mi from your airports · yours: 81%
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
- Late-arriving aircraft46%
- Airline (crew, maintenance, boarding)31%
- Air traffic control and airport volume22%
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
LGA to ACK questions
- What time of day is best to fly LGA to ACK?
- 9 AM to noon: 88% of flights arrived on time, against 79% for departures noon to 3 PM.
- Which airline is most on time from LGA to ACK?
- Republic, with a season-adjusted 81% chance of operating and arriving on time over 310 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 LGA to ACK?
- July (75% on time); the best was August (88%), 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 LGA
- ACK to LGA (return)
- LGA to ORD 67%
- LGA to ATL 76%
- LGA to BOS 73%
- LGA to DFW 70%
- LGA to MIA 70%
- LGA to MCO 69%
- LGA to DCA 68%
- LGA to DEN 71%
- LGA to FLL 68%
- LGA to CLT 77%
- LGA to IAH 76%
- LGA to DTW 78%
Most on-time flights from LGA on every route →
Live status: FAA delays and ground stops