Carrier route record
DLDTW→ATL
Delta Air Lines · Detroit to Atlanta
- Flights
- 3,703
- 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 DTW to ATL lands a B+, 4 points better than the national rate of 77.6%. Roughly 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 3,703 flights. The strongest carrier on the route with a full sample, Spirit Airlines, flew 677 at 75.0% on time.
Set against the rest of the country, Delta's DTW to ATL record is 4 points better than the US average of 77.6%. That gap is worth roughly 40 fewer late arrivals for every thousand flights.
Key figures
On time
81.6%
Arrivals under 15 minutes late, of 3,678 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
0.49%
National rate is 1.81%
Whole route
79.0%
Every carrier on DTW to ATL, 4,881 flights
These figures cover 3,703 flights between July 2025 and June 2026. The median arrival is 7 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 DTW to ATL
Delta flew 3,703 of the 4,881 flights on DTW to ATL, most of the route. Its 81.6% on time is 3 points better than the route as a whole, which runs 79.0%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Delta at 81.6% to Frontier at 65.3%.
The choice of carrier is not cosmetic here. Spirit Airlines arrives on time 75.0% of the time; Frontier Airlines manages 65.3%. 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) | 3,703 | 81.6% | 68 min | 0.49% | B+ |
| Spirit Airlines | 677 | 75.0% | 74 min | 1.92% | B |
| Frontier Airlines | 501 | 65.3% | 107 min | 1.60% | C |
Spirit leads Frontier by 10 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Delta flight numbers on DTW to ATL
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 14 points, against 10 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am944 flights87.9%
- 8am–11am889 flights87.0%
- 11am–2pm367 flights74.8%
- 2pm–5pm701 flights77.8%
- 5pm–8pm492 flights74.3%
- 8pm–5am310 flights75.5%
Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 87.9% of the time, against 74.3% for the evening window. That is 14 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 944 flights scheduled in it.
Across the year
Delta on DTW to ATL through the year
January is the weak month at 69.6% on time, against 91.5% 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. May was the busiest month here, with 337 flights.
Across the week, Thursday is the strongest day at 86.9% on time and Sunday the weakest at 77.0%. 10 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 56% of the 46,000 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.
- 56%Carrier
- 22%Late-arriving aircraft
- 18%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 56%, 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 26,000 of the 46,000 delay minutes reported here. The split is drawn from 45,809 reported delay minutes.
Cancellations are rare at 0.49%, 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 79.5% on time across 3,698 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 3,703 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 DTW to ATL
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 91.5% on time and January 69.6%, a swing of 22 points. If the dates move at all, move them out of January before you think about anything else. 3,678 completed flights over 12 months sit behind that.
Related
Where to go next
- DTW to ATL, every carrier
- Delta on ATL to DTW, the return leg
- Spirit Airlines on DTW to ATL75.0%
- Frontier Airlines on DTW to ATL65.3%
- Delta Air Lines network-wide record
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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.