Route reliability record
ORD→MCI
Chicago to Kansas City
- Flights
- 4,146
- Period
- July 2025 to June 2026
- Distance
- 403 mi
- Carriers
- 6
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 4,146 flights, of which Republic Airways flew 567 at 77.2% on time.
Republic Airways is the most reliable of the four carriers covered here at 77.2% on time across 567 flights.
Key figures
On time
70.9%
Arrivals under 15 minutes late, of 4,037 completed flights
Avg delay
74 min
Across delayed arrivals only, not all flights
Cancelled
2.51%
National rate is 1.81%
Best carrier
Republic
77.2% on time across 567 flights
These figures cover 4,146 flights between July 2025 and June 2026. Beyond the headline rate, 11.2% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
Which airline is most reliable on ORD to MCI
The choice of carrier is not cosmetic here. Republic Airways arrives on time 77.2% of the time; SkyWest Airlines manages 67.9%. Sample sizes sit next to every figure, because a two-point gap across 945 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airways | 567 | 77.2% | 66 min | 1.59% | B |
| Envoy Air | 820 | 74.2% | 60 min | 3.41% | C− |
| United Airlines | 1,435 | 71.6% | 71 min | 1.46% | C |
| SkyWest Airlines | 945 | 67.9% | 87 min | 3.81% | C− |
| PSA Airlinesthin sample | 40 | 59.0% | 56 min | 2.50% | D |
| American Airlinesthin sample | 339 | 58.8% | 90 min | 2.65% | D |
SkyWest Airlines cancels 3.8% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
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 23 points, against 9 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am434 flights81.7%
- 8am–11am757 flights79.5%
- 11am–2pm689 flights78.7%
- 2pm–5pm875 flights69.9%
- 5pm–8pm623 flights59.5%
- 8pm–5am768 flights59.2%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 59.2% on time, against 81.7% for the 5am–8am 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 875 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 21 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.
July is the worst month at 59.9% on time, 21 points below September, the best at 81.3%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. May was the busiest month here, with 410 flights.
Across the week, Tuesday is the strongest day at 76.1% on time and Sunday the weakest at 65.5%. 11 points is a smaller lever than departure hour, but it is free.
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 87,000 reported delay minutes.
- 42%Late-arriving aircraft
- 31%Carrier
- 16%National Airspace System
- 12%Extreme weather
- 0%Security
Extreme weather accounts for 12% 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 1.9 times the usual weather exposure. The split is drawn from 87,281 reported delay minutes.
42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 87,000 reported delay minutes here, that single category outweighs weather by 3 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit.
Cancellations run at 2.51%, against 1.81% nationally. That is about one flight in 40 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.2% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
At 403 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 74.7% on time across 4,148 flights, 4 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 4 points of difference.
The sample behind these figures is 4,146 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 81.3% on time and July 59.9%, a swing of 21 points. If the dates move at all, move them out of July before you think about anything else. 4,037 completed flights over 12 months sit behind that.
Common questions
ORD to MCI questions
How often is ORD to MCI delayed?
Roughly one flight in three arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 29.1% of the 4,146 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on ORD to MCI?
Republic Airways leads at 77.2% on time across 567 flights. SkyWest Airlines is at the other end on 67.9%, a gap of 9 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on ORD to MCI?
The 5am–8am departure window is the strongest at 81.7% on time. The 8pm–5am window is the weakest at 59.2%, 23 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 July delays on ORD to MCI?
July is the weakest month at 59.9% on time, compared with 81.3% in September. Across the year that is 21 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
- MCI to ORD — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- Kansas City International (MCI) delay statistics
- Republic Airways on-time record77.2%
- Envoy Air on-time record74.2%
- United Airlines on-time record71.6%
- Why the first flight of the morning is statistically safest
- What a cancellation rate actually tells you (and what it hides)
Direction matters. ORD to MCI and MCI to ORD are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.