Detroit airport delays: how reliable is flying out of DTW?

In September 2025, Detroit Metropolitan was one of the best-run hubs in the country: 87.1% of its departures arrived on time. Three months later, in December, it managed 62.0%. That 25.1-point swing between its best and worst month is wider than at almost any other large airport, and it is the single most useful thing to know about flying out of Detroit.

Over the whole of September 2025 to August 2026, Detroit's departures ran 76.7% on time against 77.3% nationally, ranking 40 of 60 airports with a page. Cancellations were close to the national rate at 1.97%. The long delays were not: 9.1% of departures arrived an hour or more late against 8.3% nationally, and late flights averaged 77 minutes behind.

As everywhere on this site, the figures are for flights leaving Detroit.

Delta, SkyWest and Spirit

Delta at Detroit flies about half of all departures and runs slightly above the airport average. SkyWest at Detroit, flying Delta Connection regional jets, is the second-largest operator and runs below it. That is worth noticing, because at Minneapolis, Delta's other northern hub, SkyWest's record sits level with Delta's. Same brand, same airline. The difference is likely the route mix and the winter: SkyWest's busiest route from Detroit is O'Hare, one of the least punctual destinations in the country, and much of the rest is short hops to small Michigan and Midwest cities flown through Detroit's harder winter months.

Spirit at Detroit is the third-largest carrier, one of the bigger Spirit bases in the country, and runs close to the average here, better than Spirit's network as a whole at 72.0%. (Spirit's filings stop in early May 2026, so its Detroit figure contains no June or July flights.) American and Republic, flying in from their own hubs, lead the chart. Frontier trails it.

The day at Detroit

Detroit's first wave is its weak spot. Departures between 5am and 8am ran 86.0% on time, against 89.3% nationally, one of the lowest dawn figures of any large hub. In winter, first-wave aircraft sit outside overnight and need de-icing before they leave, and a queue at the de-icing pads hits exactly the flights that would otherwise be the safest of the day. The winter storm guide describes how those queues build.

The rest of the day follows the familiar slope to 67.7% between 5pm and 8pm, and a partial recovery to 71.6% after 8pm. The 18.3-point gap between dawn and evening is a little narrower than the national 21.3 points, mostly because the dawn figure starts lower.

Individual flights show the range. Delta's 5:20am to Atlanta, DL 2375, and its 7am to Boston, DL 1163, were among the most punctual departures from Detroit. The late-afternoon departures into the Northeast were among the worst: DL 1707 to Boston and DL 2030 to Washington National, both leaving around 5:30 to 6pm, each arrived on time little more than half the time.

Winter is the whole story

December at Detroit was the worst month, January almost as bad at 64.8%, and March a third weak winter month at 71.6%. Those three months combined winter weather with heavy holiday and spring-break travel. Over the national 2025 Christmas and New Year window, which ran 6.5 points worse than normal weeks, Detroit had one of the lowest on-time rates of any large airport, and during the 2026 spring break window its on-time rate fell further than most.

Summer is the opposite of the Southeast. June at Detroit ran 79.1% and September, the best month, 87.1%. The thunderstorm season that breaks Atlanta and Charlotte in July touches Detroit less. The best and worst months guide ranks the airports with the widest calendar swings; Detroit belongs near the top of it.

One year holds one winter, and a single storm week can move a monthly figure several points.

But December, January and March all pointing the same way is a pattern, not an accident.

{
 "flights": 121140,
 "completed": 118484,
 "onTimePct": 76.7,
 "veryLatePct": 9.1,
 "avgDelayMin": 76.9,
 "medianArrDelay": -6,
 "cancelPct": 1.97,
 "divertPct": 0.22,
 "causes": {
  "carrier": 0.5094,
  "weather": 0.0843,
  "nas": 0.2168,
  "security": 0.0006,
  "lateAircraft": 0.1889
 },
 "byHourBlock": [86, 81.9, 78.5, 73.6, 67.7, 71.6 ],
 "byMonth": [64.8, 75.7, 71.6, 81.1, 80.9, 79.1, 73.9, 78.4, 87.1, 85.3, 78.4, 62 ],
 "byDow": [74.6, 79.2, 79.2, 78.1, 75.1, 79.3, 71.9 ]
}

This is the file the pipeline writes for Detroit; the monthly strip above is its byMonth row, and every airport-level figure in this guide is recomputed from it whenever the DOT publishes a new month.

Weekdays

The best day was Saturday at 79.3% and the worst Sunday at 71.9%, a spread of 7.4 points. Detroit is one of the few large airports where Saturday comes out best, consistent with Saturday being the lightest day of the week for the schedule. Monday (74.6%) and Friday (75.1%) were both weak.

Where the delay minutes come from

Detroit's cause profile mirrors Minneapolis and, to a lesser degree, Atlanta: the airline category takes 51% of delay minutes against 33% nationally, and late-arriving aircraft only 19%. Delta's network codes 44% of its delay minutes to the airline, and Endeavor Air never appears as a separate carrier at Delta's hubs in this data. I read that as a reporting convention, not a finding about Delta's operation. The categories less affected by coding tell the real story. The air traffic share, 22%, is at the national level, well below O'Hare and the New York airports. The extreme-weather share, 8%, is above the national 6%, as it is at Minneapolis.

Best and worst routes

The weakest busy routes from Detroit go to the most constrained destinations: Detroit to San Francisco at 66.4%, Detroit to Washington National at 68.3% and Detroit to O'Hare, the busiest route, at 72.2%. On the O'Hare route, Envoy's flights ran well ahead of SkyWest's. Detroit to LaGuardia cancelled 5.44% of its flights, with Spirit's service the most exposed.

The strongest routes run south and east to well-run airports: Detroit to Charlotte at 83.3%, Detroit to Baltimore at 80.7% and Detroit to Denver at 79.5%, which cancelled just 0.51%. Detroit to Atlanta, Delta hub to Delta hub, ran 78.9% with Delta's own flights ahead of the route average.

Connecting at Detroit

Detroit is a large Delta hub for the Midwest and for flights to Asia and Europe, and its inbound legs vary more than Minneapolis's. Arrivals from the West are strong: Salt Lake City to Detroit ran 88.2% and Seattle to Detroit 86.6%. Arrivals from O'Hare and South Florida are the risky ones: O'Hare to Detroit ran 71.1% and Fort Lauderdale to Detroit 72.3%. The missed-connection guide compares Detroit with the other large hubs, and the connection risk calculator runs a specific inbound route.

My call on Detroit

Between April and October, Detroit is a strong hub. Book it with confidence, and prefer it to O'Hare for a Midwest connection.

From December to March, route through Minneapolis or Atlanta if you can. Detroit's winter months were among the weakest of any hub, and the first wave, normally the safe choice, is exposed to de-icing queues. At 64.8% on time in January 2026, I would not book a 50-minute connection here that month.

Avoid the late-afternoon departures to the Northeast. The 5pm to 6pm flights to Boston, Washington and LaGuardia combine Detroit's afternoon slope with the Northeast's evening congestion.

Pick Delta or a guest carrier over SkyWest on the O'Hare route when the times allow.

Explore Detroit: Detroit Metropolitan (DTW) · Delta at DTW · DTW in December · Minneapolis-St Paul guide · Connection risk calculator