Route reliability record
EWR→ORD
Newark to Chicago
- Flights
- 6,039
- Period
- July 2025 to June 2026
- Distance
- 719 mi
- Carriers
- 5
This route carries a cancellation problem, not just a delay problem: 3.3% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, about seven flights in ten 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 6,039 flights, of which American Airlines flew 735 at 77.8% on time.
American Airlines is the most reliable of the three carriers covered here at 77.8% on time across 735 flights.
Key figures
On time
71.5%
Arrivals under 15 minutes late, of 5,827 completed flights
Avg delay
81 min
Across delayed arrivals only, not all flights
Cancelled
3.33%
National rate is 1.81%
Best carrier
American
77.8% on time across 735 flights
These figures cover 6,039 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 airline is most reliable on EWR to ORD
The choice of carrier is not cosmetic here. American Airlines arrives on time 77.8% of the time; United Airlines manages 71.1%. Sample sizes sit next to every figure, because a two-point gap across 4,389 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| American Airlines | 735 | 77.8% | 108 min | 3.81% | B− |
| Envoy Air | 657 | 73.2% | 89 min | 5.48% | C− |
| United Airlines | 4,389 | 71.1% | 76 min | 2.26% | C |
| Spirit Airlinesthin sample | 156 | 53.8% | 102 min | 16.67% | F− |
| Republic Airwaysthin sample | 102 | 52.8% | 82 min | 11.76% | F− |
Envoy Air cancels 5.5% 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 33 points, against 7 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,244 flights85.1%
- 8am–11am1,098 flights80.3%
- 11am–2pm978 flights76.1%
- 2pm–5pm1,104 flights65.6%
- 5pm–8pm1,052 flights51.7%
- 8pm–5am563 flights62.6%
Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 51.7% 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 5am–8am window is the busiest, with 1,244 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 20 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.
September is the best month on the calendar at 80.5% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. May was the busiest month here, with 552 flights.
Across the week, Tuesday is the strongest day at 76.0% on time and Sunday the weakest at 67.1%. 9 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 135,000 reported delay minutes.
- 41%National Airspace System
- 35%Late-arriving aircraft
- 18%Carrier
- 6%Extreme weather
- 0%Security
35% 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 135,000 reported delay minutes here, that single category outweighs weather by 6 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 135,192 reported delay minutes.
41% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 55,000 minutes out of 135,000, against a national NAS share of 21%.
Cancellations run at 3.33%, against 1.81% nationally. That is about 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. 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.
The 719 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg runs 69.4% on time across 6,044 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 6,039 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 delay figures matter less here than the 3.33% cancellation rate. A late arrival costs you a little over an hour; 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. 5,827 completed flights over 12 months sit behind that.
Common questions
EWR to ORD questions
How often is EWR to ORD delayed?
Roughly one flight in four arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 28.5% of the 6,039 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 EWR to ORD?
American Airlines leads at 77.8% on time across 735 flights. United Airlines is at the other end on 71.1%, a gap of 7 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 EWR to ORD?
The 5am–8am departure window is the strongest at 85.1% on time. The 5pm–8pm window is the weakest at 51.7%, 33 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 October delays on EWR to ORD?
October is the weakest month at 60.2% on time, compared with 80.5% in September. Across the year that is 20 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 EWR — the return legseparate record
- Newark Liberty International (EWR) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- American Airlines on-time record77.8%
- Envoy Air on-time record73.2%
- United Airlines on-time record71.1%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Direction matters. EWR to ORD and ORD to EWR 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.