Route reliability record
LEX→ORD
Lexington to Chicago
- Flights
- 1,734
- 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, 6 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 1,734 LEX to ORD flights, with a median arrival 5 minutes early.
Best time to fly LEX to ORD: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 85.1% of the time and Wednesday flights 75.1%, against 71.8% for the route overall.
The national on-time rate over the same period is 77.6%, so this route runs 6 points behind the country as a whole. Across a thousand flights that is about 58 extra late arrivals.
Key figures
On time
71.8%
Arrivals under 15 minutes late, of 1,680 completed flights
Avg delay
94 min
Across delayed arrivals only, not all flights
Cancelled
2.94%
National rate is 1.81%
Best carrier
SkyWest
70.6% on time across 1,415 flights
These figures cover 1,734 flights between July 2025 and June 2026. Beyond the headline rate, 13.4% 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 LEX 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 |
|---|---|---|---|---|---|
| PSA Airlinesthin sample | 23 | 82.6% | 82 min | 0.00% | B+ |
| Envoy Airthin sample | 296 | 76.7% | 89 min | 1.35% | B |
| SkyWest Airlines | 1,415 | 70.6% | 95 min | 3.32% | 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 30 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–8am522 flights85.1%
- 8am–11am162 flights81.0%
- 11am–2pm309 flights73.6%
- 2pm–5pm195 flights69.5%
- 5pm–8pm527 flights55.4%
- 8pm–5am19 flights—
Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 55.4% on time, against 85.1% 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 5pm–8pm window is the busiest, with 527 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 31 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.
December is the weak month at 50.0% on time, against 81.4% in May. 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. October was the busiest month here, with 229 flights.
Across the week, Wednesday is the strongest day at 75.1% on time and Saturday the weakest at 69.2%. 6 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.
- 36%Carrier
- 29%Late-arriving aircraft
- 22%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 2.0 times the usual weather exposure. The split is drawn from 44,665 reported delay minutes.
The largest share of delay minutes, 36%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 16,000 of the 45,000 delay minutes reported here.
Cancellations run at 2.94%, against 1.81% nationally. That is roughly one flight in 30 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. 13.4% 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 5am–8am window matters as much as it does.
The return leg runs 69.8% on time across 1,733 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 1,734 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 ORD after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 2.94% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 1,680 completed flights over 12 months sit behind that.
Common questions
LEX to ORD questions
How often is LEX to ORD delayed?
Roughly one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 28.2% of the 1,734 flights in this analysis, against 22.4% nationally. Delayed flights are late by an hour and a half on average.
How reliable is LEX to ORD compared with the rest of the country?
71.8% of flights arrive on time here against a national 77.6%, a difference of 6 points against it. That is worth a C on this site's grading scale.
What time of day has the fewest delays on LEX to ORD?
The 5am–8am departure window is the strongest at 85.1% on time. The 5pm–8pm window is the weakest at 55.4%, 30 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 December delays on LEX to ORD?
December is the weakest month at 50.0% on time, compared with 81.4% in May. Across the year that is 31 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 LEX — the return legseparate record
- Chicago O'Hare International (ORD) delay statistics
- Envoy Air on LEX to ORD76.7%
- SkyWest Airlines on LEX to ORD70.6%
- LEX to ATL, a related route88.6%
- LGA to ORD, a related route67.3%
- LEX to CLT, a related route83.7%
- PSA Airlines on-time record82.6%
- Envoy Air on-time record76.7%
- SkyWest Airlines on-time record70.6%
- The US routes with the most cancellations
- What a cancellation rate actually tells you (and what it hides)
Direction matters. LEX to ORD and ORD to LEX 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.