Chicago, IL · departure reliability
ORD
Chicago O'Hare International
- Departures
- 357,404
- Period
- July 2025 to June 2026
- Carriers
- 12
- US rank
- #1 by volume
Chicago
Chicago O'Hare International 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 357,404 flights, of which JetBlue Airways flew 1,105 at 77.8% on time.
JetBlue Airways is the most reliable of the twelve carriers covered here at 77.8% on time across 1,105 flights.
Key figures
On time
71.0%
Departures arriving under 15 minutes late at their destination
Avg delay
78 min
Across delayed flights only
Cancelled
2.68%
National rate is 1.81%
Best carrier
JetBlue
77.8% on time here
These figures cover 357,000 flights between July 2025 and June 2026. Beyond the headline rate, 11.8% 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 airlines run best out of ORD
The choice of carrier is not cosmetic here. JetBlue Airways arrives on time 77.8% of the time; PSA Airlines manages 59.9%. Sample sizes sit next to every figure, because a two-point gap across 3,385 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 99,843 | 73.1% | 71 min | 1.23% | C |
| SkyWest Airlines | 76,556 | 65.9% | 88 min | 3.84% | C− |
| American Airlines | 60,749 | 66.8% | 82 min | 2.66% | C |
| Envoy Air | 57,088 | 76.1% | 62 min | 2.82% | B |
| Republic Airways | 32,164 | 76.2% | 73 min | 3.56% | B− |
| Delta Air Lines | 10,543 | 73.3% | 91 min | 2.68% | C |
| Spirit Airlines | 4,581 | 65.9% | 83 min | 4.91% | C− |
| Frontier Airlines | 4,157 | 67.4% | 105 min | 3.44% | C− |
| Southwest Airlines | 3,980 | 70.1% | 68 min | 1.31% | C |
| PSA Airlines | 3,385 | 59.9% | 131 min | 6.79% | D− |
| Alaska Airlines | 3,253 | 69.0% | 62 min | 1.75% | C |
| JetBlue Airways | 1,105 | 77.8% | 91 min | 3.53% | B− |
PSA Airlines cancels 6.8% 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.
Route by route
Busiest routes out of ORD
Route-level records vary far more than the airport average. These are the 25 busiest departures from ORD, each with its own on-time rate against the airport-wide 71.0%.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| ORD to LGA · New York | 11,625 | 67.3% | 83 min | 4.74% | C− |
| ORD to BOS · Boston | 7,642 | 67.6% | 78 min | 2.79% | C |
| ORD to DCA · Washington | 6,987 | 69.1% | 82 min | 3.05% | C− |
| ORD to LAX · Los Angeles | 6,961 | 72.5% | 73 min | 1.59% | C |
| ORD to DFW · Dallas-Fort Worth | 6,955 | 69.7% | 87 min | 3.09% | C− |
| ORD to ATL · Atlanta | 6,409 | 75.0% | 81 min | 2.26% | B |
| ORD to MCO · Orlando | 6,347 | 72.2% | 76 min | 1.56% | C |
| ORD to MSP · Minneapolis | 6,324 | 69.7% | 81 min | 2.28% | C |
| ORD to DEN · Denver | 6,169 | 74.2% | 77 min | 1.23% | C |
| ORD to IAH · Houston | 6,077 | 75.0% | 74 min | 1.43% | B |
| ORD to EWR · Newark | 6,044 | 69.4% | 83 min | 3.26% | C− |
| ORD to DTW · Detroit | 5,956 | 70.6% | 83 min | 3.04% | C− |
| ORD to SFO · San Francisco | 5,627 | 67.6% | 73 min | 1.32% | C |
| ORD to PHX · Phoenix | 5,594 | 72.9% | 77 min | 1.72% | C |
| ORD to SEA · Seattle | 5,572 | 68.5% | 64 min | 1.45% | C |
| ORD to LAS · Las Vegas | 5,297 | 73.7% | 72 min | 1.32% | C |
| ORD to IND · Indianapolis | 5,206 | 74.2% | 75 min | 3.63% | C− |
| ORD to MKE · Milwaukee | 5,201 | 64.1% | 93 min | 4.75% | D− |
| ORD to BNA · Nashville | 5,021 | 68.6% | 79 min | 2.53% | C |
| ORD to PHL · Philadelphia | 4,918 | 71.2% | 94 min | 2.85% | C |
| ORD to CLE · Cleveland | 4,899 | 70.1% | 76 min | 2.98% | C |
| ORD to CMH · Columbus | 4,843 | 73.1% | 75 min | 2.58% | C |
| ORD to CVG · Cincinnati | 4,647 | 72.2% | 75 min | 3.12% | C− |
| ORD to MIA · Miami | 4,450 | 74.0% | 70 min | 1.96% | C |
| ORD to CLT · Charlotte | 4,306 | 73.5% | 83 min | 2.30% | C |
Departure window
The best time of day to leave ORD
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 24 points, against 18 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am38,595 flights85.0%
- 8am–11am77,778 flights77.1%
- 11am–2pm57,717 flights74.2%
- 2pm–5pm68,327 flights67.5%
- 5pm–8pm62,382 flights61.3%
- 8pm–5am52,605 flights63.4%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 61.3% on time, against 85.0% 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 8am–11am window is the busiest, with 77,778 flights scheduled in it.
Across the year
When ORD runs late
ORD's year swings by 18 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 61.0% on time, against 79.2% in September. 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. May was the busiest month here, with 33,733 flights.
Across the week, Tuesday is the strongest day at 75.9% on time and Sunday the weakest at 66.7%. 9 points is a smaller lever than departure hour, but it is free.
Delay causes
Why ORD 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 7.86 million reported delay minutes.
- 41%Late-arriving aircraft
- 28%Carrier
- 21%National Airspace System
- 10%Extreme weather
- 0%Security
41% 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 7.86 million reported delay minutes here, that single category outweighs weather by 4 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. The split is drawn from 7,863,306 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 85.0% on time here.
Cancellations run at 2.68%, 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.
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.8% 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.
357,404 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.
What to do with this
Flying out of ORD
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 79.2% on time and December 61.0%, a swing of 18 points. If the dates move at all, move them out of December before you think about anything else. 346,800 completed flights over 12 months sit behind that.
Common questions
ORD delay questions
How often is Chicago (ORD) 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 29.0% of the 357,404 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 Chicago (ORD)?
JetBlue Airways leads at 77.8% on time across 1,105 flights. PSA Airlines is at the other end on 59.9%, a gap of 18 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 Chicago (ORD)?
The 5am–8am departure window is the strongest at 85.0% on time. The 5pm–8pm window is the weakest at 61.3%, 24 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 Chicago (ORD)?
December is the weakest month at 61.0% on time, compared with 79.2% in September. Across the year that is 18 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 LGA — New York67.3%
- ORD to BOS — Boston67.6%
- ORD to DCA — Washington69.1%
- ORD to LAX — Los Angeles72.5%
- ORD to DFW — Dallas-Fort Worth69.7%
- ORD to ATL — Atlanta75.0%
- United Airlines on-time record73.1%
- SkyWest Airlines on-time record65.9%
- American Airlines on-time record66.8%
- Envoy Air on-time record76.1%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.