Carrier route record
UAMIA→EWR
United Airlines · Miami to Newark
- Flights
- 2,253
- Period
- July 2025 to June 2026
- Share of route
- 57%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with United Airlines.
United on MIA to EWR sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 2,253 flights, with a median arrival 6 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate United on MIA to EWR from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
74.9%
Arrivals under 15 minutes late, of 2,200 completed flights
Avg delay
88 min
Across delayed arrivals only, not all flights
Cancelled
2.04%
National rate is 1.81%
Whole route
71.8%
Every carrier on MIA to EWR, 3,985 flights
These figures cover 2,253 flights between July 2025 and June 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
United against every carrier on MIA to EWR
United flew 2,253 of the 3,985 flights on MIA to EWR, most of the route. Its 74.9% on time is 3 points better than the route as a whole, which runs 71.8%. Ranked by on-time rate it is number two of four carriers on the route, where the range runs from Envoy at 100.0% to Spirit at 63.9%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 |
|---|---|---|---|---|---|
| Envoy Airthin sample | 1 | 100.0% | — | 0.00% | A+ |
| United Airlines (this page) | 2,253 | 74.9% | 88 min | 2.04% | C |
| American Airlines | 1,424 | 68.5% | 73 min | 3.02% | C− |
| Spirit Airlinesthin sample | 307 | 63.9% | 91 min | 5.86% | D− |
Flight by flight
United flight numbers on MIA to EWR
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 37 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–8am561 flights91.5%
- 8am–11am155 flights87.0%
- 11am–2pm470 flights81.6%
- 2pm–5pm340 flights67.9%
- 5pm–8pm525 flights55.0%
- 8pm–5am202 flights65.1%
Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 55.0% on time, against 91.5% 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 561 flights scheduled in it.
Across the year
United on MIA to EWR through the year
July is the worst month at 66.4% on time, 20 points below May, the best at 86.6%. 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. March was the busiest month here, with 243 flights.
Across the week, Wednesday is the strongest day at 78.1% on time and Sunday the weakest at 66.2%. 12 points is a smaller lever than departure hour, but it is free.
Delay causes
Why United runs late on this route
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 49,000 reported delay minutes.
- 41%National Airspace System
- 33%Late-arriving aircraft
- 22%Carrier
- 3%Extreme weather
- 0%Security
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 20,000 minutes out of 49,000, against a national NAS share of 21%. The split is drawn from 48,624 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 91.5% on time here.
Cancellations sit at 2.04% against a national 1.81%, which is ordinary. Diversions add another 0.31%.
Connections and stage length
What a delay here 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 8.1% 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 1,085 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 77.6% on time across 2,251 flights, within 3 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 2,253 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 MIA to EWR
Put together: the calendar is the biggest lever here, not the carrier or the hour. May runs 86.6% on time and July 66.4%, a swing of 20 points. If the dates move at all, move them out of July before you think about anything else. 2,200 completed flights over 12 months sit behind that.
Related
Where to go next
- MIA to EWR, every carrier
- United on EWR to MIA, the return leg
- American Airlines on MIA to EWR68.5%
- Spirit Airlines on MIA to EWR63.9%
- United Airlines network-wide record
- Miami International (MIA) delay statistics
- Newark Liberty International (EWR) delay statistics
- 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. Last updated 15 September 2026; recomputed monthly. How this data is collected.