Route reliability record
DTW→EWR
Detroit to Newark
- Flights
- 3,764
- Period
- July 2025 to June 2026
- Distance
- 488 mi
- Carriers
- 4
This route carries a cancellation problem, not just a delay problem: 5.0% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, close to three flights in four 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 3,764 flights, of which Republic Airways flew 1,491 at 79.6% on time.
Republic Airways is the most reliable of the three carriers covered here at 79.6% on time across 1,491 flights.
Key figures
On time
75.8%
Arrivals under 15 minutes late, of 3,571 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
5.05%
National rate is 1.81%
Best carrier
Republic
79.6% on time across 1,491 flights
These figures cover 3,764 flights between July 2025 and June 2026. Beyond the headline rate, 11.1% 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
Which airline is most reliable on DTW to EWR
The choice of carrier is not cosmetic here. Republic Airways arrives on time 79.6% of the time; Spirit Airlines manages 67.7%. Sample sizes sit next to every figure, because a two-point gap across 554 flights means less than a ten-point one.
| 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 | 554 | 67.7% | 78 min | 8.30% | C− |
Spirit Airlines cancels 8.3% 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
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 25 points, against 12 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am780 flights87.6%
- 8am–11am690 flights85.9%
- 11am–2pm423 flights78.7%
- 2pm–5pm629 flights72.7%
- 5pm–8pm717 flights62.3%
- 8pm–5am525 flights63.4%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 62.3% on time, against 87.6% for the 5am–8am 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 5am–8am window is the busiest, with 780 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 25 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
July is the worst month at 63.5% on time, 25 points below May, the best at 88.1%. 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. September was the busiest month here, with 359 flights.
Across the week, Tuesday is the strongest day at 79.1% on time and Sunday the weakest at 69.1%. 10 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. National Airspace System accounts for 50% of the 68,000 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.
- 50%National Airspace System
- 28%Carrier
- 19%Late-arriving aircraft
- 2%Extreme weather
- 0%Security
50% 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 34,000 minutes out of 68,000, against a national NAS share of 21%. The split is drawn from 67,537 reported delay minutes.
Cancellations run at 5.05%, against 1.81% nationally. That is about 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 actually costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.1% 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.
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 79.2% on time across 3,782 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.
The sample behind these figures is 3,764 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 this route
Put together: the delay figures matter less here than the 5.05% 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. 3,571 completed flights over 12 months sit behind that.
Common questions
DTW to EWR questions
How often is DTW to EWR delayed?
About one flight in four arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 24.2% of the 3,764 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on DTW to EWR?
Republic Airways leads at 79.6% on time across 1,491 flights. Spirit Airlines is at the other end on 67.7%, a gap of 12 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on DTW to EWR?
The 5am–8am departure window is the strongest at 87.6% on time. The 5pm–8pm window is the weakest at 62.3%, 25 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on DTW to EWR?
July is the weakest month at 63.5% on time, compared with 88.1% in May. Across the year that is 25 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- EWR to DTW — the return legseparate record
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Newark Liberty International (EWR) delay statistics
- United Airlines on-time record91.7%
- Republic Airways on-time record79.6%
- Delta Air Lines on-time record74.0%
- The best time of day to fly, according to 7.04 million flight records
- What a cancellation rate actually tells you (and what it hides)
Direction matters. DTW to EWR and EWR to DTW are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.