Carrier route record
NKEWR→MIA
Spirit Airlines · Newark to Miami
- Flights
- 308
- 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 EWR to MIA draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 308 flights. The strongest carrier on the route with a full sample, American Airlines, flew 1,425 at 80.5% on time.
The national on-time rate over the same period is 77.6%, so Spirit on EWR to MIA runs 17 points behind the country as a whole. Across a thousand flights that is about 170 extra late arrivals.
Key figures
On time
60.6%
Arrivals under 15 minutes late, of 292 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
4.55%
National rate is 1.81%
Whole route
77.4%
Every carrier on EWR to MIA, 3,985 flights
These figures cover 308 flights between July 2025 and June 2026. Beyond the headline rate, 18.5% 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 EWR to MIA
Spirit flew 308 of the 3,985 flights on EWR to MIA, about 8% of it. Its 60.6% on time is 17 points worse than the route as a whole, which runs 77.4%. 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 60.6%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: 3 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 |
|---|---|---|---|---|---|
| Envoy Airthin sample | 1 | 100.0% | — | 0.00% | A+ |
| American Airlines | 1,425 | 80.5% | 84 min | 2.95% | B |
| United Airlines | 2,251 | 77.6% | 72 min | 2.18% | B |
| Spirit Airlines (this page)thin sample | 308 | 60.6% | 76 min | 4.55% | D− |
No carrier stands out. American tops the table at 80.5%, 3 points clear of the bottom, which is inside the range this kind of sample moves year to year.
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 19 points, against 3 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am57 flights68.5%
- 8am–11am33 flights63.6%
- 11am–2pm28 flights—
- 2pm–5pm127 flights49.6%
- 5pm–8pm53 flights59.6%
- 8pm–5am10 flights—
Scale runs 40% to 75%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 68.5% of the time, against 49.6% for the afternoon window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 127 flights scheduled in it.
Across the year
Spirit on EWR to MIA through the year
- Jul–Sep 202591 flights62.9%
- Oct–Dec 202589 flights65.5%
- Jan–Mar 202699 flights57.1%
- Apr–Jun 202629 flights—
Scale runs 50% to 70%. 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 60.6% on time across 308 flights.
Quarter by quarter Spirit on EWR to MIA held fairly steady: 62.9% in Jul–Sep 2025, 65.5% in Oct–Dec 2025 and 57.1% in Jan–Mar 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
Across the week, Tuesday is the strongest day at 69.8% on time and Sunday the weakest at 43.9%. 26 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Spirit 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 8,703 reported delay minutes.
- 39%National Airspace System
- 32%Carrier
- 29%Late-arriving aircraft
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 3,409 minutes out of 8,703, against a national NAS share of 21%. The split is drawn from 8,703 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 68.5% on time here.
Cancellations run at 4.55%, against 1.81% nationally. That is roughly one flight in twenty 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. 18.5% 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 63.9% on time across 307 flights, 3 points above 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. 308 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 EWR to MIA
Put together: the delay figures matter less here than the 4.55% 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. 292 completed flights over 12 months sit behind that.
Related
Where to go next
- EWR to MIA, every carrier
- Spirit on MIA to EWR, the return leg
- American Airlines on EWR to MIA80.5%
- United Airlines on EWR to MIA77.6%
- Spirit Airlines network-wide record
- Newark Liberty International (EWR) delay statistics
- Miami International (MIA) 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.