Carrier route record
DLATL→DTW
Delta Air Lines · Atlanta to Detroit
- Flights
- 3,698
- Period
- July 2025 to June 2026
- Share of route
- 76%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on ATL to DTW lands a B+, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 3,698 flights. The strongest carrier on the route with a full sample, Spirit Airlines, flew 672 at 76.4% on time.
The US average over the same twelve months is 77.6%, so there is little to separate Delta on ATL to DTW from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.5%
Arrivals under 15 minutes late, of 3,674 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.51%
National rate is 1.81%
Whole route
78.0%
Every carrier on ATL to DTW, 4,871 flights
These figures cover 3,698 flights between July 2025 and June 2026. The median arrival is 5 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
Carrier by carrier
Delta against every carrier on ATL to DTW
Delta flew 3,698 of the 4,871 flights on ATL to DTW, most of the route. Its 79.5% on time is 2 points better than the route as a whole, which runs 78.0%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Delta at 79.5% to Frontier at 69.2%.
The choice of carrier is not cosmetic here. Spirit Airlines arrives on time 76.4% of the time; Frontier Airlines manages 69.2%. Sample sizes sit next to every figure, because a two-point gap across 501 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines (this page) | 3,698 | 79.5% | 57 min | 0.51% | B+ |
| Spirit Airlines | 672 | 76.4% | 81 min | 2.08% | B |
| Frontier Airlines | 501 | 69.2% | 71 min | 1.40% | C |
Spirit leads Frontier by 7 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Delta flight numbers on ATL to DTW
Departure window
When Delta runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 25 points, against 7 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am515 flights92.4%
- 8am–11am388 flights86.2%
- 11am–2pm716 flights83.5%
- 2pm–5pm569 flights79.8%
- 5pm–8pm699 flights75.5%
- 8pm–5am811 flights67.7%
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 92.4% of the time, against 67.7% 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 811 flights scheduled in it.
Across the year
Delta on ATL to DTW through the year
July is the worst month at 68.6% on time, 19 points below April, the best at 87.5%. 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. May was the busiest month here, with 340 flights.
Across the week, Wednesday is the strongest day at 87.3% on time and Sunday the weakest at 72.5%. 15 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Delta runs late on this route
One category carries most of the weight here. Carrier accounts for 54% of the 43,000 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.
- 54%Carrier
- 23%Late-arriving aircraft
- 16%National Airspace System
- 7%Extreme weather
The largest share of delay minutes, 54%, 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 23,000 of the 43,000 delay minutes reported here. The split is drawn from 43,288 reported delay minutes.
Cancellations are rare at 0.51%, below the national 1.81% 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 costs
6.3% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says 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. 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 runs 81.6% on time across 3,703 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.
The sample behind these figures is 3,698 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 Delta on ATL to DTW
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 87.5% on time and July 68.6%, a swing of 19 points. If the dates move at all, move them out of July before you think about anything else. 3,674 completed flights over 12 months sit behind that.
Related
Where to go next
- ATL to DTW, every carrier
- Delta on DTW to ATL, the return leg
- Spirit Airlines on ATL to DTW76.4%
- Frontier Airlines on ATL to DTW69.2%
- Delta Air Lines network-wide record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Detroit Metropolitan Wayne County (DTW) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
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.