Route reliability record
AZO→DTW
Kalamazoo to Detroit
- Flights
- 1,058
- Period
- September 2025 to August 2026
- Distance
- 113 mi
- Carriers
- 1
This route lands a B, level with the national rate of 77.3%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about 2.1 hours on average. That rests on 1,058 AZO to DTW flights, with a median arrival 9 minutes early.
Best time to fly AZO to DTW: a 5am–8am departure, ideally on a Thursday. Flights in that window arrived on time 81.6% of the time and Thursday flights 81.7%, against 77.2% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.2%
Arrivals under 15 minutes late, of 1,031 completed flights
Avg delay
125 min
Across delayed arrivals only, not all flights
Cancelled
2.55%
National rate is 1.89%
Best carrier
SkyWest
77.2% on time across 1,058 flights
These figures cover 1,058 flights between September 2025 and August 2026. Beyond the headline rate, 14.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on AZO to DTW
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 1,058 | 77.2% | 125 min | 2.55% | B |
Flight by flight
Flights on AZO 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.
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Best ways to make this trip
The most reliable ways to fly Kalamazoo 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. 1 of the top 2 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. GRR → DTWGrand Rapids to Detroit | SkyWest Airlines | 77.4% | 78.1% | 0.96% | 5am–8am, Sat | — |
| 2. AZO → DTWKalamazoo to Detroit | SkyWest Airlines | 75.2% | 77.2% | 2.55% | 5am–8am, Thu | OO 3980 05:30 |
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 is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 1,058 flights.
- 5am–8am365 flights81.6%
- 8am–11am9 flights—
- 11am–2pm315 flights76.1%
- 2pm–5pm98 flights77.3%
- 5pm–8pm271 flights71.8%
- 8pm–5am—
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 81.6% of the time, against 71.8% for the evening window. That is 10 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.
Explore
Filter AZO to DTW by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On AZO to DTW, the best departure window is 5am–8am at 81.6% on time and the worst is 5pm–8pm at 71.8%, a real gap of 9.8 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am81.6%
- 8–11am—
- 11am–2pm76.1%
- 2–5pm77.3%
- 5–8pm71.8%
- 8pm–5am—
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 35 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.
January is the weak month at 55.6% on time, against 90.6% 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. July was the busiest month here, with 120 flights.
Across the week, Thursday is the strongest day at 81.7% on time and Monday the weakest at 70.9%, a spread of 11 points.
Delay causes
Why this route gets delayed
Carrier accounts for 71% of the 29,000 delay minutes carriers reported here, and the remaining four split what is left.
- 71%Carrier
- 24%Extreme weather
- 5%National Airspace System
Extreme weather accounts for 24% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.9 times the usual weather exposure. The split is drawn from 29,460 reported delay minutes.
The largest share of delay minutes, 71%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 21,000 of the 29,000 delay minutes reported here.
Cancellations run at 2.55%, against 1.89% nationally. That is about one flight in 40 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
14.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 113 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 runs 75.2% on time across 1,058 flights, within 2 points 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. 1,058 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.
Work out the risk of missing a connection in DTW after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 1,058 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 77.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 1,031 completed flights over 12 months sit behind that.
Common questions
AZO to DTW questions
How often is AZO to DTW delayed?
Roughly 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 22.8% of the 1,058 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 2.1 hours on average.
How reliable is AZO to DTW compared with the rest of the country?
77.2% of flights arrive on time here against a national 77.3%, a difference of half a point against it. That is worth a B on this site's grading scale.
What time of day has the fewest delays on AZO to DTW?
The 5am–8am departure window is the strongest at 81.6% on time. The 5pm–8pm window is the weakest at 71.8%, 10 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 January delays on AZO to DTW?
January is the weakest month at 55.6% on time, compared with 90.6% in September. Across the year that is 35 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 AZO — the return legseparate record
- Detroit Metropolitan Wayne County (DTW) delay statistics
- AZO to ORD, a related route78.0%
- ORD to DTW, a related route71.1%
- ATL to DTW, a related route76.4%
- SkyWest Airlines on-time record77.2%
- The US routes with the most cancellations
- The best time of day to fly, according to 7.05 million flight records
Direction matters. AZO to DTW and DTW to AZO 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.