Route reliability record
DTW→ATL
Detroit to Atlanta
- Flights
- 4,934
- Period
- June 2025 to May 2026
- Distance
- 594 mi
- Carriers
- 3
This route lands a B+, level with the national rate of 77.4%. Roughly one flight in five arrive 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 4,934 flights, of which Delta Air Lines flew 3,701 at 80.2% on time.
Delta Air Lines is the most reliable of the three carriers covered here at 80.2% on time across 3,701 flights.
Key figures
On time
77.8%
Arrivals under 15 minutes late, of 4,879 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.89%
National rate is 1.80%
Best carrier
Delta
80.2% on time across 3,701 flights
These figures cover 4,934 flights between June 2025 and May 2026. Beyond the headline rate, 8.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Carrier by carrier
Which airline is most reliable on DTW to ATL
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 80.2% of the time; Frontier Airlines manages 64.2%. Sample sizes sit next to every figure, because a two-point gap across 477 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 3,701 | 80.2% | 68 min | 0.57% | B+ |
| Spirit Airlines | 756 | 74.5% | 72 min | 1.72% | C |
| Frontier Airlines | 477 | 64.2% | 106 min | 2.10% | D |
The spread between Delta and Frontier is 16 points, wide enough that it should decide the booking. On a hundred trips that is 16 more arrivals inside the on-time window.
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 18 points, against 16 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,239 flights86.0%
- 8am–11am966 flights84.8%
- 11am–2pm544 flights69.7%
- 2pm–5pm878 flights76.7%
- 5pm–8pm823 flights68.4%
- 8pm–5am484 flights69.9%
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 86.0% of the time, against 68.4% for the evening window. That is 18 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on.
Across the year
When delays peak on this route
This route's year swings by 20 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.
June is the worst month at 69.5% on time, 20 points below September, the best at 89.9%. 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.
Across the week, Wednesday is the strongest day at 83.3% on time and Sunday the weakest at 72.2%. 11 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
One category carries most of the weight here. Carrier accounts for 44% of the 81,000 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.
- 44%Carrier
- 34%Late-arriving aircraft
- 18%National Airspace System
- 3%Extreme weather
- 0%Security
34% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 81,000 reported delay minutes here, that single category outweighs weather by 10 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit.
The largest share of delay minutes, 44%, 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 35,000 of the 81,000 delay minutes reported here.
Cancellations are rare at 0.89%, below the national 1.80% 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
8.0% of arrivals land an hour or more late, close to the national 8.2%. 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 are the a little over an hour kind, 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 76.7% on time across 4,921 flights, within about a point 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 4,934 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 this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. September runs 89.9% on time and June 69.5%, a swing of 20 points. If the dates move at all, move them out of June before you think about anything else.
Common questions
DTW to ATL questions
How often is DTW to ATL delayed?
Roughly one flight in five arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 22.2% of the 4,934 flights in this analysis, against 22.6% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on DTW to ATL?
Delta Air Lines leads at 80.2% on time across 3,701 flights. Frontier Airlines is at the other end on 64.2%, a gap of 16 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 DTW to ATL?
The 5am–8am departure window is the strongest at 86.0% on time. The 5pm–8pm window is the weakest at 68.4%, 18 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 June delays on DTW to ATL?
June is the weakest month at 69.5% on time, compared with 89.9% in September. Across the year that is 20 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
- ATL to DTW — the return legseparate record
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Delta Air Lines on-time record80.2%
- Spirit Airlines on-time record74.5%
- Frontier Airlines on-time record64.2%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. DTW to ATL and ATL to DTW are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, June 2025 to May 2026. Updated monthly. How this data is collected.