Carrier route record
NKEWR→DTW
Spirit Airlines · Newark to Detroit
- Flights
- 553
- 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 EWR to DTW sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 553 flights. The strongest carrier on the route with a full sample, Republic Airways, flew 1,510 at 83.3% on time.
The national on-time rate over the same period is 77.6%, so Spirit on EWR to DTW runs 9 points behind the country as a whole. Across a thousand flights that is about 89 extra late arrivals.
Key figures
On time
68.7%
Arrivals under 15 minutes late, of 508 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
7.96%
National rate is 1.81%
Whole route
79.2%
Every carrier on EWR to DTW, 3,782 flights
These figures cover 553 flights between July 2025 and June 2026. Beyond the headline rate, 12.0% 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 DTW
Spirit flew 553 of the 3,782 flights on EWR to DTW, about 15% of it. Its 68.7% on time is 11 points worse than the route as a whole, which runs 79.2%. Ranked by on-time rate it is last of four carriers on the route, where the range runs from United at 84.4% to Spirit at 68.7%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The two carriers here are closely matched: 5 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 | 84.4% | 50 min | 2.04% | B |
| Republic Airways | 1,510 | 83.3% | 72 min | 5.30% | B− |
| Delta Air Lines | 1,621 | 78.6% | 104 min | 3.52% | B− |
| Spirit Airlines (this page) | 553 | 68.7% | 75 min | 7.96% | C− |
Republic Airways cancels 5.3% 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 5 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am154 flights75.0%
- 8am–11am42 flights83.3%
- 11am–2pm60 flights91.4%
- 2pm–5pm62 flights72.9%
- 5pm–8pm27 flights—
- 8pm–5am208 flights52.7%
Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 52.7% on time, against 91.4% for the 11am–2pm 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 208 flights scheduled in it.
Across the year
Spirit on EWR to DTW through the year
December is the weak month at 42.6% on time, against 89.7% in September. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. March was the busiest month here, with 62 flights.
Across the week, Tuesday is the strongest day at 76.9% on time and Sunday the weakest at 55.4%. 22 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 65% of the 12,000 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.
- 65%National Airspace System
- 20%Late-arriving aircraft
- 13%Carrier
- 1%Security
- 0%Extreme weather
65% 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 7,777 minutes out of 12,000, against a national NAS share of 21%. The split is drawn from 11,883 reported delay minutes.
Cancellations run at 7.96%, 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. 12.0% 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 11am–2pm window matters as much as it does.
The return leg runs 67.7% on time across 554 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. 553 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 DTW
Put together: the delay figures matter less here than the 7.96% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 11am–2pm 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
- EWR to DTW, every carrier
- Spirit on DTW to EWR, the return leg
- Republic Airways on EWR to DTW83.3%
- Delta Air Lines on EWR to DTW78.6%
- Spirit Airlines network-wide record
- Newark Liberty International (EWR) delay statistics
- Detroit Metropolitan Wayne County (DTW) 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.