ACK to ORD flight delays & on-time performance
Nonstop flights from Nantucket Memorial Airport to Chicago O'Hare International Airport · 924 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ACK or ORD 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 Chicago (ORD) arrived on time 66% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 6.5% were cancelled, and 10% arrived an hour or more late.
- Saturday was the most reliable day to fly (68% on time) and Sunday the least (60%).
- The largest source of delay minutes was air traffic control & airport congestion (43%).
Which airline is most on time from ACK to ORD?
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. | 82% | 0.0% | 57 min | 18.2% | 11 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 56% | 10.0% | 17 min | 5.6% | 20 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
Not enough departures across different hours to compare.
Best day of the week
On-time arrival rate by day of departure.
- Saturday68%9.5% cancelled
- Sunday60%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 congestion43%
- Extreme weather31%
- Late-arriving aircraft13%
- Airline (crew, maintenance, cleaning, fueling)13%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Air traffic control & airport congestion0%
- Security0%
ACK to ORD: common questions
- How often are ACK to ORD flights on time?
- 66% 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 Chicago cancelled?
- 6.5% of scheduled flights were cancelled (2 of 31).
- How long are typical delays?
- Across all flights the average arrival delay was 32 min (early arrivals count as zero). Flights that were late arrived 91 min behind schedule on average, and 10.3% of flights were an hour or more late.
- How long is taxi time at ACK?
- Flights on this route spent 25 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 → ORD, nonstop flights by US airlines that report to the DOT. How we calculate this.