Carrier route record
DLEWR→DTW
Delta Air Lines · Newark to Detroit
- Flights
- 1,621
- Period
- July 2025 to June 2026
- Share of route
- 43%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on EWR to DTW carries a cancellation problem, not just a delay problem: 3.5% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, about four flights in five arrive on time, worth a B− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 1,621 flights. The strongest carrier on the route with a full sample, Republic Airways, flew 1,510 at 83.3% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Delta on EWR to DTW from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
78.6%
Arrivals under 15 minutes late, of 1,563 completed flights
Avg delay
104 min
Across delayed arrivals only, not all flights
Cancelled
3.52%
National rate is 1.81%
Whole route
79.2%
Every carrier on EWR to DTW, 3,782 flights
These figures cover 1,621 flights between July 2025 and June 2026. Beyond the headline rate, 10.9% 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
Delta against every carrier on EWR to DTW
Delta flew 1,621 of the 3,782 flights on EWR to DTW, about 43% of it. Its 78.6% on time is about level with the route as a whole at 79.2%. Ranked by on-time rate it is number three 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 choice of carrier is not cosmetic here. Republic Airways arrives on time 83.3% of the time; Spirit Airlines manages 68.7%. Sample sizes sit next to every figure, because a two-point gap across 553 flights means less than a ten-point one.
| 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 (this page) | 1,621 | 78.6% | 104 min | 3.52% | B− |
| Spirit Airlines | 553 | 68.7% | 75 min | 7.96% | C− |
Spirit Airlines cancels 8.0% 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.
Flight by flight
Delta flight numbers on EWR to DTW
Departure window
When Delta 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 15 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am365 flights91.8%
- 8am–11am340 flights82.9%
- 11am–2pm362 flights79.6%
- 2pm–5pm42 flights52.5%
- 5pm–8pm309 flights75.8%
- 8pm–5am203 flights54.7%
Scale runs 45% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 91.8% of the time, against 52.5% for the afternoon window. That is 39 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 365 flights scheduled in it.
Across the year
Delta on EWR to DTW through the year
July is the worst month at 64.1% on time, 27 points below February, the best at 91.3%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. October was the busiest month here, with 150 flights.
Across the week, Tuesday is the strongest day at 85.2% on time and Monday the weakest at 74.7%. 11 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 35,000 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.
- 45%Late-arriving aircraft
- 37%Carrier
- 16%National Airspace System
- 2%Extreme weather
45% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 35,000 reported delay minutes here, that single category outweighs weather by 25 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 34,609 reported delay minutes.
The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 13,000 of the 35,000 delay minutes reported here.
Cancellations run at 3.52%, against 1.81% nationally. That is about one flight in 30 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. 10.9% 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 74.0% on time across 1,621 flights, 5 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 5 points of difference.
The sample behind these figures is 1,621 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 Delta on EWR to DTW
Put together: the delay figures matter less here than the 3.52% cancellation rate. A late arrival costs you close to two hours; 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. 1,563 completed flights over 12 months sit behind that.
Related
Where to go next
- EWR to DTW, every carrier
- Delta on DTW to EWR, the return leg
- Republic Airways on EWR to DTW83.3%
- Spirit Airlines on EWR to DTW68.7%
- Delta Air Lines network-wide record
- Newark Liberty International (EWR) delay statistics
- Detroit Metropolitan Wayne County (DTW) delay statistics
- The US routes with the most cancellations
- Same route, different airline: where the carrier you pick matters most
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.