Carrier route record
UAEWR→ORD
United Airlines · Newark to Chicago
- Flights
- 4,415
- Period
- September 2025 to August 2026
- Share of route
- 72%
- Carriers
- 5
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on EWR to ORD 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 77.3%. The late ones land a little over an hour behind schedule. That rests on 4,415 flights. The strongest carrier on the route with a full sample, American Airlines, flew 924 at 76.8% on time.
The national on-time rate over the same period is 77.3%, so United on EWR to ORD runs 7 points behind the country as a whole. Across a thousand flights that is about 70 extra late arrivals.
Key figures
On time
70.3%
Arrivals under 15 minutes late, of 4,279 completed flights
Avg delay
80 min
Across delayed arrivals only, not all flights
Cancelled
2.83%
National rate is 1.89%
Whole route
70.7%
Every carrier on EWR to ORD, 6,123 flights
These figures cover 4,415 flights between September 2025 and August 2026. Beyond the headline rate, 11.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
United against every carrier on EWR to ORD
United flew 4,415 of the 6,123 flights on EWR to ORD, most of the route. Its 70.3% on time is about level with the route as a whole at 70.7%. Ranked by on-time rate it is number three of five carriers on the route, where the range runs from American at 76.8% to Spirit at 51.6%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: 5 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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| American Airlines | 924 | 76.8% | 116 min | 4.76% | B− |
| Envoy Air | 533 | 72.2% | 84 min | 6.19% | C− |
| United Airlines (this page) | 4,415 | 70.3% | 80 min | 2.83% | C |
| Republic Airwaysthin sample | 102 | 52.8% | 82 min | 11.76% | F− |
| Spirit Airlinesthin sample | 149 | 51.6% | 102 min | 16.78% | F− |
Envoy Air cancels 6.2% 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.
Flight by flight
United flight numbers on EWR to ORD
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Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 32 points, against 5 points between the best and worst carrier.
- 5am–8am768 flights83.2%
- 8am–11am916 flights79.6%
- 11am–2pm726 flights75.5%
- 2pm–5pm838 flights61.9%
- 5pm–8pm725 flights51.4%
- 8pm–5am442 flights65.9%
Scale runs 45% to 90%.
The 5pm–8pm window is where this operation falls apart: 51.4% on time, against 83.2% 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. The 8am–11am window is the busiest, with 916 flights scheduled in it.
Across the year
United on EWR to ORD through the year
August is the worst month at 58.5% on time, 25 points below February, the best at 83.4%. 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. May was the busiest month here, with 396 flights.
Across the week, Tuesday is the strongest day at 74.8% on time and Sunday the weakest at 64.3%, a spread of 11 points.
Arrival by arrival
How late United on EWR to ORD runs when it is late
The 1,273 late arrivals split 422 under half an hour, 355 between 30 and 60 minutes, and 496 an hour or more.
- 15+ min early996 flights23.3%
- Within 15 min2,010 flights47.0%
- 15–29 min late422 flights9.9%
- 30–59 min late355 flights8.3%
- 1–2 hours late247 flights5.8%
- 2+ hours late249 flights5.8%
Scale runs 0% to 100%.
Share of 4,279 completed flights by arrival against schedule.
123 of 906 late departures made up the time and arrived on time, 14% of them. In the other direction, 490 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at ORD.
The worst days
Worst days for United on EWR to ORD
The latest arrival of the period was on 10 June 2026, 11 hours 9 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The five worst days are spread across June, August, March, November and July, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 June 2026 | 11 hours 9 minutes | National Airspace System |
| 7 August 2026 | 10 hours 14 minutes | Extreme weather |
| 31 March 2026 | 9 hours 54 minutes | Carrier |
| 9 November 2025 | 9 hours 52 minutes | Late-arriving aircraft |
| 21 July 2026 | 9 hours 29 minutes | Extreme weather |
Delay causes
Why United runs late on this route
National Airspace System accounts for 48% of the 101,000 delay minutes carriers reported here, and the remaining four split what is left.
- 48%National Airspace System
- 27%Late-arriving aircraft
- 19%Carrier
- 6%Extreme weather
48% 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 48,000 minutes out of 101,000, against a national NAS share of 21%. The split is drawn from 101,338 reported delay minutes.
Cancellations run at 2.83%, against 1.89% nationally. That is roughly 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 costs
11.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
The return leg runs 72.0% on time across 4,415 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 4,415 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 United on EWR to ORD
Put together: the delay figures matter less here than the 2.83% 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. 4,279 completed flights over 12 months sit behind that.
Related
Where to go next
- EWR to ORD, every carrier
- United on ORD to EWR, the return leg
- American Airlines on EWR to ORD76.8%
- Envoy Air on EWR to ORD72.2%
- Republic Airways on EWR to ORD52.8%
- Spirit Airlines on EWR to ORD51.6%
- United Airlines network-wide record
- Newark Liberty International (EWR) delay statistics
- Chicago O'Hare International (ORD) delay statistics
- The US routes with the most cancellations
- The best time of day to fly, according to 7.05 million flight records
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.