Route reliability record
ORD→LEX
Chicago to Lexington
- Flights
- 1,733
- Period
- July 2025 to June 2026
- Distance
- 323 mi
- Carriers
- 3
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, 8 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 1,733 ORD to LEX flights, with a median arrival 1 minute early.
Best time to fly ORD to LEX: a 11am–2pm departure, ideally on a Tuesday. Flights in that window arrived on time 78.9% of the time and Tuesday flights 75.6%, against 69.8% for the route overall.
The national on-time rate over the same period is 77.6%, so this route runs 8 points behind the country as a whole. Across a thousand flights that is about 78 extra late arrivals.
Key figures
On time
69.8%
Arrivals under 15 minutes late, of 1,684 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
2.65%
National rate is 1.81%
Best carrier
SkyWest
69.1% on time across 1,415 flights
These figures cover 1,733 flights between July 2025 and June 2026. Beyond the headline rate, 13.5% 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 LEX
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 |
|---|---|---|---|---|---|
| Envoy Airthin sample | 295 | 72.9% | 77 min | 1.36% | C |
| PSA Airlinesthin sample | 23 | 69.6% | 62 min | 0.00% | C+ |
| SkyWest Airlines | 1,415 | 69.1% | 92 min | 2.97% | C |
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 13 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am55 flights74.5%
- 8am–11am321 flights76.9%
- 11am–2pm204 flights78.9%
- 2pm–5pm505 flights65.6%
- 5pm–8pm211 flights65.5%
- 8pm–5am437 flights66.4%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 78.9% on time, ahead of 5pm–8pm at 65.5%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 2pm–5pm window is the busiest, with 505 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 27 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 55.7% on time, 27 points below September, the best at 82.9%. 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. October was the busiest month here, with 228 flights.
Across the week, Tuesday is the strongest day at 75.6% on time and Monday the weakest at 63.6%. 12 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 45,000 reported delay minutes.
- 34%Carrier
- 29%Late-arriving aircraft
- 21%Extreme weather
- 16%National Airspace System
Extreme weather accounts for 21% 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 3.3 times the usual weather exposure. The split is drawn from 45,443 reported delay minutes.
Cancellations run at 2.65%, 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. 13.5% 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 323 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 11am–2pm window matters as much as it does.
The return leg runs 71.8% on time across 1,734 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,733 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.
Work out the risk of missing a connection in LEX after this flight
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 82.9% on time and July 55.7%, a swing of 27 points. If the dates move at all, move them out of July before you think about anything else. 1,684 completed flights over 12 months sit behind that.
Common questions
ORD to LEX questions
How often is ORD to LEX delayed?
Roughly 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 30.2% of the 1,733 flights in this analysis, against 22.4% nationally. Delayed flights are late by an hour and a half on average.
How reliable is ORD to LEX compared with the rest of the country?
69.8% of flights arrive on time here against a national 77.6%, a difference of 8 points against it. That is worth a C on this site's grading scale.
What time of day has the fewest delays on ORD to LEX?
The 11am–2pm departure window is the strongest at 78.9% on time. The 5pm–8pm window is the weakest at 65.5%, 13 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 LEX?
July is the weakest month at 55.7% on time, compared with 82.9% in September. Across the year that is 27 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
- LEX to ORD — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- Envoy Air on ORD to LEX72.9%
- SkyWest Airlines on ORD to LEX69.1%
- ORD to LGA, a related route67.3%
- ATL to LEX, a related route85.0%
- ORD to BOS, a related route67.6%
- Envoy Air on-time record72.9%
- PSA Airlines on-time record69.6%
- SkyWest Airlines on-time record69.1%
- The US routes with the most cancellations
- What a cancellation rate actually tells you (and what it hides)
Direction matters. ORD to LEX and LEX to ORD 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.