ORD to ACK flight delays & on-time performance
Nonstop flights from Chicago O'Hare International Airport to Nantucket Memorial Airport · 924 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ORD or ACK right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Chicago (ORD) to Nantucket (ACK) arrived on time 90% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0% were cancelled, and 6% arrived an hour or more late.
- Saturday was the most reliable day to fly (95% on time) and Sunday the least (80%).
- The largest source of delay minutes was airline (crew, maintenance, cleaning, fueling) (100%).
Which airline is most on time from ORD to ACK?
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. | 100% | 0.0% | 1 min | 0.0% | 11 |
| SkyWest AirlinesRegional airline operating flights for United Express, Delta Connection, American Eagle and Alaska. | 85% | 0.0% | 16 min | 10.0% | 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.
- Saturday95%0.0% cancelled
- Sunday80%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.
- Airline (crew, maintenance, cleaning, fueling)100%
- Late-arriving aircraft0%
- Air traffic control & airport congestion0%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
No cancellation causes recorded in this period.
ORD to ACK: common questions
- How often are ORD to ACK flights on time?
- 90% 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 Chicago to Nantucket cancelled?
- 0.0% of scheduled flights were cancelled (0 of 31).
- How long are typical delays?
- Across all flights the average arrival delay was 11 min (early arrivals count as zero). Flights that were late arrived 102 min behind schedule on average, and 6.5% of flights were an hour or more late.
- How long is taxi time at ORD?
- Flights on this route spent 24 min taxiing from the gate to takeoff on average.
Related routes
Return trip: ACK to ORD — 66% on time
More flights from Chicago
More flights to Nantucket
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ORD → ACK, nonstop flights by US airlines that report to the DOT. How we calculate this.