Carrier route record
UAMIA→EWR
United Airlines · Miami to Newark
- Flights
- 2,240
- Period
- September 2025 to August 2026
- Share of route
- 57%
- Carriers
- 3
Historical statistics for September 2025 to August 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 B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 2,240 flights, with a median arrival 6 minutes early.
The US average over the same twelve months is 77.3%, 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
75.5%
Arrivals under 15 minutes late, of 2,177 completed flights
Avg delay
88 min
Across delayed arrivals only, not all flights
Cancelled
2.37%
National rate is 1.89%
Whole route
72.2%
Every carrier on MIA to EWR, 3,913 flights
These figures cover 2,240 flights between September 2025 and August 2026. Beyond the headline rate, 11.1% 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 MIA to EWR
United flew 2,240 of the 3,913 flights on MIA to EWR, most of the route. Its 75.5% on time is 3 points better than the route as a whole, which runs 72.2%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from United at 75.5% to Spirit at 64.2%. One 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 |
|---|---|---|---|---|---|
| United Airlines (this page) | 2,240 | 75.5% | 88 min | 2.37% | B |
| American Airlines | 1,428 | 68.4% | 72 min | 3.29% | C− |
| Spirit Airlinesthin sample | 245 | 64.2% | 84 min | 6.12% | D− |
Flight by flight
United flight numbers on MIA to EWR
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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 36 points, against half a point between the best and worst carrier.
- 5am–8am498 flights92.1%
- 8am–11am199 flights86.2%
- 11am–2pm488 flights81.9%
- 2pm–5pm344 flights67.3%
- 5pm–8pm509 flights56.1%
- 8pm–5am202 flights69.8%
Scale runs 50% to 100%.
The 5pm–8pm window is where this operation falls apart: 56.1% on time, against 92.1% 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 5pm–8pm window is the busiest, with 509 flights scheduled in it.
Across the year
United on MIA to EWR through the year
May is the best month on the calendar at 86.6% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. March was the busiest month here, with 243 flights.
Across the week, Wednesday is the strongest day at 79.4% on time and Sunday the weakest at 68.7%, a spread of 11 points.
Arrival by arrival
How late United on MIA to EWR runs when it is late
United on MIA to EWR often beats the schedule: 657 of 2,177 completed flights, 30%, arrived 15 minutes or more early. The 533 late arrivals split 152 under half an hour, 139 between 30 and 60 minutes, and 242 an hour or more.
- 15+ min early657 flights30.2%
- Within 15 min987 flights45.3%
- 15–29 min late152 flights7.0%
- 30–59 min late139 flights6.4%
- 1–2 hours late127 flights5.8%
- 2+ hours late115 flights5.3%
Scale runs 0% to 100%.
Share of 2,177 completed flights by arrival against schedule.
83 of 505 late departures made up the time and arrived on time, 16% of them. In the other direction, 111 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 EWR.
The worst days
Worst days for United on MIA to EWR
The latest arrival of the period was on 16 March 2026, 20 hours 6 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The five worst days are spread across March, November, August and February, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 16 March 2026 | 20 hours 6 minutes | Carrier |
| 8 November 2025 | 17 hours 48 minutes | Carrier |
| 20 August 2026 | 15 hours 13 minutes | Extreme weather |
| 26 February 2026 | 9 hours 58 minutes | Late-arriving aircraft |
| 14 March 2026 | 9 hours 57 minutes | Late-arriving aircraft |
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 47,000 reported delay minutes.
- 39%National Airspace System
- 33%Late-arriving aircraft
- 23%Carrier
- 4%Extreme weather
- 0%Security
39% 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 18,000 minutes out of 47,000, against a national NAS share of 21%. The split is drawn from 46,827 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 92.1% on time here.
Cancellations sit at 2.37% against a national 1.89%, which is ordinary. Diversions add another 0.45%.
Connections and stage length
What a delay here costs
11.1% 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 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.
The return leg runs 77.1% on time across 2,238 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 2,240 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 March 67.4%, a swing of 19 points. If the dates move at all, move them out of March before you think about anything else. 2,177 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 EWR68.4%
- Spirit Airlines on MIA to EWR64.2%
- 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 7.05 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.