Carrier route record
NKDTW→EWR
Spirit Airlines · Detroit to Newark
- Flights
- 554
- Period
- July 2025 to June 2026
- Share of route
- 15%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Spirit Airlines.
Spirit on DTW to EWR draws a C−. About 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 554 flights. The strongest carrier on the route with a full sample, Republic Airways, flew 1,491 at 79.6% on time.
The national on-time rate over the same period is 77.6%, so Spirit on DTW to EWR runs 10 points behind the country as a whole. Across a thousand flights that is about 99 extra late arrivals.
Key figures
On time
67.7%
Arrivals under 15 minutes late, of 508 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
8.30%
National rate is 1.81%
Whole route
75.8%
Every carrier on DTW to EWR, 3,764 flights
These figures cover 554 flights between July 2025 and June 2026. Beyond the headline rate, 15.7% 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
Spirit against every carrier on DTW to EWR
Spirit flew 554 of the 3,764 flights on DTW to EWR, about 15% of it. Its 67.7% on time is 8 points worse than the route as a whole, which runs 75.8%. Ranked by on-time rate it is last of four carriers on the route, where the range runs from United at 91.7% to Spirit at 67.7%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: 6 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 |
|---|---|---|---|---|---|
| United Airlinesthin sample | 98 | 91.7% | 97 min | 2.04% | A |
| Republic Airways | 1,491 | 79.6% | 74 min | 5.77% | B− |
| Delta Air Lines | 1,621 | 74.0% | 81 min | 3.45% | C− |
| Spirit Airlines (this page) | 554 | 67.7% | 78 min | 8.30% | C− |
Republic Airways cancels 5.8% 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 39 points, against 6 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am136 flights83.2%
- 8am–11am96 flights87.1%
- 11am–2pm51 flights79.2%
- 2pm–5pm13 flights—
- 5pm–8pm96 flights52.3%
- 8pm–5am162 flights48.3%
Scale runs 40% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 48.3% on time, against 87.1% 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 8pm–5am window is the busiest, with 162 flights scheduled in it.
Across the year
Spirit on DTW to EWR through the year
September is the best month on the calendar at 75.9% 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 62 flights.
Across the week, Wednesday is the strongest day at 75.3% on time and Sunday the weakest at 54.3%. 21 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 64% of the 13,000 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.
- 64%National Airspace System
- 21%Carrier
- 14%Late-arriving aircraft
- 1%Extreme weather
- 0%Security
64% 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 8,198 minutes out of 13,000, against a national NAS share of 21%. The split is drawn from 12,839 reported delay minutes.
Cancellations run at 8.30%, against 1.81% nationally. That is about one flight in twelve 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. 15.7% 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.
At 488 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 8am–11am window matters as much as it does.
The return leg runs 68.7% on time across 553 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 554 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 DTW to EWR
Put together: the delay figures matter less here than the 8.30% cancellation rate. A late arrival costs you a little over an hour; 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. 508 completed flights over 12 months sit behind that.
Related
Where to go next
- DTW to EWR, every carrier
- Spirit on EWR to DTW, the return leg
- Republic Airways on DTW to EWR79.6%
- Delta Air Lines on DTW to EWR74.0%
- Spirit Airlines network-wide record
- Detroit Metropolitan Wayne County (DTW) 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.