Route reliability record
MIA→DTW
Miami to Detroit
- Flights
- 1,813
- Period
- July 2025 to June 2026
- Distance
- 1,145 mi
- Carriers
- 6
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.6%. The late ones land a little over an hour behind schedule. That rests on 1,813 MIA to DTW flights, of which Delta Air Lines flew 966 at 77.7% on time.
Best time to fly MIA to DTW: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 88.5% of the time and Wednesday flights 79.8%, against 72.9% for the route overall.
The national on-time rate over the same period is 77.6%, so this route runs 5 points behind the country as a whole. Across a thousand flights that is about 47 extra late arrivals.
Key figures
On time
72.9%
Arrivals under 15 minutes late, of 1,784 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
1.43%
National rate is 1.81%
Best carrier
Delta
77.7% on time across 966 flights
These figures cover 1,813 flights between July 2025 and June 2026. Beyond the headline rate, 9.1% 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 MIA to DTW
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 77.7% of the time; American Airlines manages 68.3%. Sample sizes sit next to every figure, because a two-point gap across 394 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Airthin sample | 87 | 82.8% | 46 min | 0.00% | B+ |
| Delta Air Lines | 966 | 77.7% | 88 min | 0.93% | B+ |
| American Airlines | 394 | 68.3% | 66 min | 1.27% | C |
| Frontier Airlinesthin sample | 64 | 67.7% | 88 min | 3.12% | C− |
| Spirit Airlinesthin sample | 292 | 61.7% | 71 min | 3.42% | D− |
| Republic Airwaysthin sample | 10 | 60.0% | 162 min | 0.00% | D+ |
Delta leads American by 9 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Flights on MIA to DTW
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Best ways to make this trip
The most reliable ways to fly Miami to Detroit
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. FLL → DTWFort Lauderdale to Detroit | Delta Air Lines | 78.3% | 79.3% | 1.27% | 5am–8am, Wed | DL 2631 06:00 |
| 2. MIA → DTWMiami to Detroit | Delta Air Lines | 77.0% | 77.7% | 0.93% | 8am–11am, Wed | DL 2638 08:05 |
| 3. MIA → DTWMiami to Detroit | American Airlines | 67.4% | 68.3% | 1.27% | 5pm–8pm, Fri | — |
| 4. FLL → DTWFort Lauderdale to Detroit | Spirit Airlines | 60.8% | 62.4% | 2.58% | 5am–8am, Wed | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
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 26 points, against 9 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am25 flights—
- 8am–11am386 flights88.5%
- 11am–2pm427 flights76.6%
- 2pm–5pm131 flights69.8%
- 5pm–8pm471 flights65.4%
- 8pm–5am373 flights62.6%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 62.6% on time, against 88.5% 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 5pm–8pm window is the busiest, with 471 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 20 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.
October is the best month on the calendar at 84.4% 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 226 flights.
Across the week, Wednesday is the strongest day at 79.8% on time and Sunday the weakest at 67.7%. 12 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
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 38,000 reported delay minutes.
- 42%Carrier
- 36%Late-arriving aircraft
- 19%National Airspace System
- 3%Extreme weather
- 0%Security
36% 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 38,000 reported delay minutes here, that single category outweighs weather by 11 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 37,546 reported delay minutes.
The largest share of delay minutes, 42%, 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 16,000 of the 38,000 delay minutes reported here.
Cancellations sit at 1.43% against a national 1.81%, which is ordinary. Diversions add another 0.17%.
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. 9.1% 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.
The 1,145 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 80.5% on time across 1,815 flights, 8 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 8 points of difference.
The sample behind these figures is 1,813 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.
Work out the risk of missing a connection in DTW after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. October runs 84.4% on time and March 64.4%, a swing of 20 points. If the dates move at all, move them out of March before you think about anything else. 1,784 completed flights over 12 months sit behind that.
Common questions
MIA to DTW questions
How often is MIA to DTW delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 27.1% of the 1,813 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 MIA to DTW?
Delta Air Lines leads at 77.7% on time across 966 flights. American Airlines is at the other end on 68.3%, a gap of 9 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 MIA to DTW?
The 8am–11am departure window is the strongest at 88.5% on time. The 8pm–5am window is the weakest at 62.6%, 26 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 March delays on MIA to DTW?
March is the weakest month at 64.4% on time, compared with 84.4% in October. Across the year that is 20 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
- DTW to MIA — the return legseparate record
- Miami International (MIA) delay statistics
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Delta Air Lines on MIA to DTW77.7%
- American Airlines on MIA to DTW68.3%
- Spirit Airlines on MIA to DTW61.7%
- MIA to ATL, a related route73.7%
- ORD to DTW, a related route70.6%
- MIA to LGA, a related route68.0%
- Envoy Air on-time record82.8%
- Delta Air Lines on-time record77.7%
- American Airlines on-time record68.3%
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
Direction matters. MIA to DTW and DTW to MIA are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.