Route reliability record
ATL→DTW
Atlanta to Detroit
- Flights
- 4,821
- Period
- September 2025 to August 2026
- Distance
- 594 mi
- Carriers
- 3
This route lands a B+, about a point worse than the national rate of 77.3%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 4,821 ATL to DTW flights, of which Spirit Airlines flew 501 at 78.3% on time.
Best time to fly ATL to DTW: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 89.8% of the time and Wednesday flights 85.5%, against 76.4% for the route overall.
Spirit Airlines is the most reliable of the three carriers covered here at 78.3% on time across 501 flights.
Key figures
On time
76.4%
Arrivals under 15 minutes late, of 4,777 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
0.81%
National rate is 1.89%
Best carrier
Spirit
78.3% on time across 501 flights
These figures cover 4,821 flights between September 2025 and August 2026. Beyond the headline rate, 8.3% 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 ATL to DTW
The choice of carrier is not cosmetic here. Spirit Airlines arrives on time 78.3% of the time; Frontier Airlines manages 64.6%. Sample sizes sit next to every figure, because a two-point gap across 546 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlines | 501 | 78.3% | 82 min | 2.59% | B |
| Delta Air Lines | 3,774 | 77.9% | 60 min | 0.50% | B+ |
| Frontier Airlines | 546 | 64.6% | 68 min | 1.28% | D |
The spread between Spirit and Frontier is 14 points, wide enough that it should decide the booking. On a hundred trips that is 14 more arrivals inside the on-time window.
Flight by flight
Flights on ATL 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.
- Delta 129809:0084.3% · 365 flights
- Delta 103113:0083.9% · 365 flights
- Delta 124011:0082.7% · 365 flights
- Delta 164607:2590.6% · 364 flights
- Delta 100515:1575.2% · 362 flights
- Delta 294022:5972.6% · 354 flights
- Delta 206716:4974.6% · 348 flights
- Delta 147818:4575.4% · 347 flights
- Delta 123220:3066.8% · 303 flights
- Frontier 126406:0066.8% · 279 flights
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Best ways to make this trip
The most reliable ways to fly Atlanta to Detroit
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. ATL → DTWAtlanta to Detroit | Delta Air Lines | 77.5% | 77.9% | 0.50% | 5am–8am, Wed | DL 1646 07:25 |
| 2. ATL → DTWAtlanta to Detroit | Spirit Airlines | 76.3% | 78.3% | 2.59% | 5am–8am, Thu | — |
| 3. ATL → DTWAtlanta to Detroit | Frontier Airlines | 63.8% | 64.6% | 1.28% | 5am–8am, Fri | F9 1264 06:00 |
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 25 points, against 14 points between the best and worst carrier.
- 5am–8am651 flights89.8%
- 8am–11am580 flights82.6%
- 11am–2pm862 flights80.7%
- 2pm–5pm818 flights74.6%
- 5pm–8pm831 flights74.0%
- 8pm–5am1,079 flights65.1%
Scale runs 55% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.8% of the time, against 65.1% for the overnight window. That is 25 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 1,079 flights scheduled in it.
Explore
Filter ATL 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 ATL to DTW, the best departure window is 5am–8am at 89.8% on time and the worst is 8pm–5am at 65.1%, a wide gap of 24.7 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am89.8%
- 8–11am82.6%
- 11am–2pm80.7%
- 2–5pm74.6%
- 5–8pm74.0%
- 8pm–5am65.1%
best all US flightsScale 55% to 95%.
Across the year
When delays peak on this route
This route's year swings by 31 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 56.7% on time, 31 points below September, the best at 87.9%. 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 427 flights.
Across the week, Wednesday is the strongest day at 85.5% on time and Sunday the weakest at 68.9%, a spread of 17 points.
Delay causes
Why this route gets delayed
Carrier accounts for 44% of the 72,000 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 36%Late-arriving aircraft
- 15%National Airspace System
- 5%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. Across 72,000 reported delay minutes here, that single category outweighs weather by 7 to one. The split is drawn from 71,505 reported delay minutes.
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 32,000 of the 72,000 delay minutes reported here.
Cancellations are rare at 0.81%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
8.3% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 594 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.
The return leg runs 78.9% on time across 4,832 flights, within 3 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 4,821 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. September runs 87.9% on time and July 56.7%, a swing of 31 points. If the dates move at all, move them out of July before you think about anything else. 4,777 completed flights over 12 months sit behind that.
Common questions
ATL to DTW questions
How often is ATL 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 23.6% of the 4,821 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on ATL to DTW?
Spirit Airlines leads at 78.3% on time across 501 flights. Frontier Airlines is at the other end on 64.6%, a gap of 14 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 ATL to DTW?
The 5am–8am departure window is the strongest at 89.8% on time. The 8pm–5am window is the weakest at 65.1%, 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 ATL to DTW?
July is the weakest month at 56.7% on time, compared with 87.9% in September. Across the year that is 31 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 ATL — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Spirit Airlines on ATL to DTW78.3%
- Delta Air Lines on ATL to DTW77.9%
- Frontier Airlines on ATL to DTW64.6%
- ATL to LGA, a related route72.3%
- ORD to DTW, a related route71.1%
- ATL to MCO, a related route70.3%
- Spirit Airlines on-time record78.3%
- Delta Air Lines on-time record77.9%
- Frontier Airlines on-time record64.6%
- Same route, different airline: where the carrier you pick matters most
- Why the first flight of the morning is statistically safest
Direction matters. ATL to DTW and DTW to ATL 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.