ACK to ORD flight delays
Nantucket, MA (ACK) Chicago, IL (ORD) · 924 miles
31 flights · January 2025 – August 2026 · US Bureau of Transportation Statistics
This route flew fewer than 50 times in the period, which is too few for an on-time rate to mean anything. The figures below are shown as recorded, but the route is not graded.
57.14%
Arrived on time
Within 15 minutes of schedule
9.68%
Cancelled
Share of scheduled flights
133 min
When late, late by
Average across delayed arrivals
58 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Cancellation, not delay, is the risk worth pricing here: 9.68% of scheduled flights never operated. A late flight still gets you there. A cancelled one leaves you rebooking, and on a route with few daily departures that can mean losing a day.
This is a late route. Flights from Nantucket to Chicago miss their scheduled arrival often enough that a tight connection at the far end is a connection at risk.
The two directions do not behave alike. ORD to ACK arrives on time 29.5 points more often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
This route does worse than its own airport. ACK as a whole runs 20.5 points more punctual than these flights, which points at something specific to the route — the time of day it is scheduled, or the aircraft that feed it — rather than the airport.
Every airline on ACK to ORD
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 20 | 50% | 10% | 136 min | — |
| Republic Airways | 11 | 70% | 9.09% | 122 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
ORD to ACK Chicago back to Nantucket 86.67% on time —Common questions
Are flights from Nantucket to Chicago usually delayed?
57.14% of flights on the ACK to ORD route arrived within 15 minutes of schedule, so roughly 4 in every ten arrived late. That is worse than the average route in this record.
How often are ACK to ORD flights cancelled?
9.68% of scheduled flights did not operate — about 97 in every thousand. That is high enough that cancellation, not delay, is the risk worth planning around.
When ACK to ORD flights are late, how late are they?
About 133 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on ACK to ORD during January 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →