Route reliability record

EWR→ORD

Newark to Chicago

Flights: 5,984
Period: June 2025 to May 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 5,984 flights, of which American Airlines flew 641 at 76.8% on time.

American Airlines is the most reliable of the three carriers covered here at 76.8% on time across 641 flights.

On time

71.4%

Arrivals under 15 minutes late, of 5,778 completed flights

Avg delay

80 min

Across delayed arrivals only, not all flights

Cancelled

3.26%

National rate is 1.80%

Best carrier

American

76.8% on time across 641 flights

These figures cover 5,984 flights between June 2025 and May 2026. Beyond the headline rate, 11.7% 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 three carriers here are closely matched: 6 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.

On-time performance by carrier on EWR to ORD
Airline	Flights	On time	Avg delay	Cancelled	Grade
American Airlines	641	76.8%	103 min	4.37%	B−
Envoy Air	721	73.4%	88 min	5.13%	C−
United Airlines	4,330	71.1%	75 min	2.12%	C
Spirit Airlinesthin sample	186	61.9%	102 min	13.98%	D−
Republic Airwaysthin sample	106	53.8%	81 min	11.32%	F−

Envoy Air cancels 5.1% 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 35 points, against 6 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am1,248 flights85.2%
8am–11am1,093 flights80.1%
11am–2pm981 flights76.0%
2pm–5pm1,074 flights66.2%
5pm–8pm1,043 flights50.7%
8pm–5am545 flights62.9%

Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.

The 5pm–8pm window is where this operation falls apart: 50.7% on time, against 85.2% 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.

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.

Darker means more delays. Figures are on-time percentages.September best, October worst

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.

Across the week, Tuesday is the strongest day at 75.3% on time and Sunday the weakest at 68.2%. 7 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 132,000 reported delay minutes.

National Airspace System
40%
Late-arriving aircraft
35%
Carrier
20%
Extreme weather
6%
Security
0%

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 132,000 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.

40% 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 53,000 minutes out of 132,000, against a national NAS share of 21%.

Cancellations run at 3.26%, against 1.80% 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. 11.7% of arrivals land a full hour or more behind schedule, against 8.2% 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 69.3% on time across 5,992 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 5,984 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 3.26% 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.

Common questions

EWR to ORD questions

How often is EWR to 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 28.6% of the 5,984 flights in this analysis, against 22.6% 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 76.8% on time across 641 flights. United Airlines is at the other end on 71.1%, a gap of 6 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 85.2% on time. The 5pm–8pm window is the weakest at 50.7%, 35 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.

Where to go next

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, June 2025 to May 2026. Updated monthly. How this data is collected.

Key figures