Carrier route record
NKMIA→EWR
Spirit Airlines · Miami to Newark
- Flights
- 307
- Period
- July 2025 to June 2026
- Share of route
- 8%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Spirit Airlines.
Spirit on MIA to EWR draws a D−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 307 flights. The strongest carrier on the route with a full sample, United Airlines, flew 2,253 at 74.9% on time.
The national on-time rate over the same period is 77.6%, so Spirit on MIA to EWR runs 14 points behind the country as a whole. Across a thousand flights that is about 137 extra late arrivals.
Key figures
On time
63.9%
Arrivals under 15 minutes late, of 288 completed flights
Avg delay
91 min
Across delayed arrivals only, not all flights
Cancelled
5.86%
National rate is 1.81%
Whole route
71.8%
Every carrier on MIA to EWR, 3,985 flights
These figures cover 307 flights between July 2025 and June 2026. Beyond the headline rate, 20.1% 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
Spirit against every carrier on MIA to EWR
Spirit flew 307 of the 3,985 flights on MIA to EWR, about 8% of it. Its 63.9% on time is 8 points worse than the route as a whole, which runs 71.8%. Ranked by on-time rate it is last of four carriers on the route, where the range runs from Envoy at 100.0% to Spirit at 63.9%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. United Airlines arrives on time 74.9% of the time; American Airlines manages 68.5%. Sample sizes sit next to every figure, because a two-point gap across 1,424 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Airthin sample | 1 | 100.0% | — | 0.00% | A+ |
| United Airlines | 2,253 | 74.9% | 88 min | 2.04% | C |
| American Airlines | 1,424 | 68.5% | 73 min | 3.02% | C− |
| Spirit Airlines (this page)thin sample | 307 | 63.9% | 91 min | 5.86% | D− |
American Airlines cancels 3.0% 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
When Spirit runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 24 points, against 6 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am8 flights—
- 8am–11am78 flights80.5%
- 11am–2pm109 flights58.0%
- 2pm–5pm22 flights—
- 5pm–8pm75 flights56.5%
- 8pm–5am15 flights—
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 56.5% on time, against 80.5% for the 8am–11am 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 11am–2pm window is the busiest, with 109 flights scheduled in it.
Across the year
Spirit on MIA to EWR through the year
- Jul–Sep 202592 flights68.5%
- Oct–Dec 202588 flights73.5%
- Jan–Mar 202697 flights44.2%
- Apr–Jun 202630 flights80.0%
Scale runs 35% to 85%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 63.9% on time across 307 flights.
Spirit on MIA to EWR did not run the same all year. Its best quarter was Apr–Jun 2026 at 80.0% on time and its weakest Jan–Mar 2026 at 44.2%, a swing of 36 points on roughly 77 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
Across the week, Tuesday is the strongest day at 70.5% on time and Friday the weakest at 55.8%. 15 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Spirit runs late on this route
One category carries most of the weight here. National Airspace System accounts for 57% of the 9,501 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 57%National Airspace System
- 23%Late-arriving aircraft
- 18%Carrier
- 2%Extreme weather
57% 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 5,407 minutes out of 9,501, against a national NAS share of 21%. The split is drawn from 9,501 reported delay minutes.
Cancellations run at 5.86%, against 1.81% nationally. That is roughly one flight in fifteen 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 20.1% 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 is a different operation and performs like one: it runs 60.6% on time across 308 flights, 3 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 3 points of difference.
One caution: this is a thin sample. 307 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Spirit on MIA to EWR
Put together: the delay figures matter less here than the 5.86% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 288 completed flights over 12 months sit behind that.
Related
Where to go next
- MIA to EWR, every carrier
- Spirit on EWR to MIA, the return leg
- United Airlines on MIA to EWR74.9%
- American Airlines on MIA to EWR68.5%
- Spirit Airlines network-wide record
- Miami International (MIA) delay statistics
- Newark Liberty International (EWR) delay statistics
- The US routes with the most cancellations
- 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.