Route reliability record
CMX→ORD
Hancock to Chicago
- Flights
- 788
- Period
- September 2025 to August 2026
- Distance
- 360 mi
- Carriers
- 1
This route carries a cancellation problem, not just a delay problem: 7.2% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, about two flights in three arrive on time, worth a C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 788 CMX to ORD flights, with a median arrival 1 minute early.
Best time to fly CMX to ORD: a 8am–11am departure, ideally on a Tuesday. Flights in that window arrived on time 72.4% of the time and Tuesday flights 77.8%, against 67.1% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 10 points behind the country as a whole. Across a thousand flights that is about 102 extra late arrivals.
Key figures
On time
67.1%
Arrivals under 15 minutes late, of 730 completed flights
Avg delay
134 min
Across delayed arrivals only, not all flights
Cancelled
7.23%
National rate is 1.89%
Best carrier
SkyWest
67.1% on time across 788 flights
These figures cover 788 flights between September 2025 and August 2026. Beyond the headline rate, 16.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on CMX to ORD
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 788 | 67.1% | 134 min | 7.23% | C− |
Flight by flight
Flights on CMX to ORD
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 26 points, against half a point between the best and worst carrier.
- 5am–8am21 flights—
- 8am–11am344 flights72.4%
- 11am–2pm—
- 2pm–5pm363 flights64.1%
- 5pm–8pm60 flights46.3%
- 8pm–5am—
Scale runs 40% to 80%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 46.3% on time, against 72.4% for the 8am–11am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 2pm–5pm window is the busiest, with 363 flights scheduled in it.
Explore
Filter CMX to ORD by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On CMX to ORD, the best departure window is 8am–11am at 72.4% on time and the worst is 5pm–8pm at 46.3%, a wide gap of 26.1 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am72.4%
- 11am–2pm—
- 2–5pm64.1%
- 5–8pm46.3%
- 8pm–5am—
best all US flightsScale 40% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 33 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
January is the weak month at 53.8% on time, against 87.1% in October. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. July was the busiest month here, with 80 flights.
Across the week, Tuesday is the strongest day at 77.8% on time and Sunday the weakest at 53.2%, a spread of 25 points.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 32,000 reported delay minutes.
- 33%Carrier
- 31%Late-arriving aircraft
- 18%Extreme weather
- 18%National Airspace System
- 0%Security
Extreme weather accounts for 18% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.0 times the usual weather exposure. The split is drawn from 32,086 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 72.4% on time here.
Cancellations run at 7.23%, against 1.89% nationally. That is about one flight in fifteen cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here actually costs
16.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 360 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8am–11am window matters as much as it does.
The return leg runs 67.6% on time across 788 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 788 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
Work out the risk of missing a connection in ORD after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 7.23% cancellation rate. A late arrival costs you about 2.2 hours; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 730 completed flights over 12 months sit behind that.
Common questions
CMX to ORD questions
How often is CMX to ORD delayed?
About one flight in three arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 32.9% of the 788 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 2.2 hours on average.
How reliable is CMX to ORD compared with the rest of the country?
67.1% of flights arrive on time here against a national 77.3%, a difference of 10 points against it. That is worth a C− on this site's grading scale.
What time of day has the fewest delays on CMX to ORD?
The 8am–11am departure window is the strongest at 72.4% on time. The 5pm–8pm window is the weakest at 46.3%, 26 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are January delays on CMX to ORD?
January is the weakest month at 53.8% on time, compared with 87.1% in October. Across the year that is 33 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- ORD to CMX — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- LGA to ORD, a related route66.7%
- BOS to ORD, a related route71.9%
- LAX to ORD, a related route76.4%
- SkyWest Airlines on-time record67.1%
- The US routes with the most cancellations
- The best time of day to fly, according to 7.05 million flight records
Direction matters. CMX to ORD and ORD to CMX are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.