Route reliability record
ATL→DAY
Atlanta to Dayton
- Flights
- 1,408
- Period
- September 2025 to August 2026
- Distance
- 432 mi
- Carriers
- 1
This route earns a B. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 55 minutes. That rests on 1,408 ATL to DAY flights, with a median arrival 9 minutes early.
Best time to fly ATL to DAY: a 8am–11am departure, ideally on a Wednesday. Flights in that window arrived on time 89.1% of the time and Wednesday flights 88.8%, against 84.9% for the route overall.
Set against the rest of the country, this route's record is 8 points better than the US average of 77.3%. That gap is worth roughly 76 fewer late arrivals for every thousand flights.
Key figures
On time
84.9%
Arrivals under 15 minutes late, of 1,380 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
1.85%
National rate is 1.89%
Best carrier
Delta
84.9% on time across 1,408 flights
These figures cover 1,408 flights between September 2025 and August 2026. The median arrival is 9 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.
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Carrier by carrier
Which airline is most reliable on ATL to DAY
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 |
|---|---|---|---|---|---|
| Delta Air Lines | 1,408 | 84.9% | 54 min | 1.85% | B |
Flight by flight
Flights on ATL to DAY
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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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 1,408 flights.
- 5am–8am—
- 8am–11am346 flights89.1%
- 11am–2pm332 flights86.9%
- 2pm–5pm357 flights79.5%
- 5pm–8pm14 flights—
- 8pm–5am359 flights84.7%
Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 89.1% of the time, against 79.5% for the afternoon 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 8pm–5am window is the busiest, with 359 flights scheduled in it.
Explore
Filter ATL to DAY 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 DAY, the best departure window is 8am–11am at 89.1% on time and the worst is 2pm–5pm at 79.5%, a real gap of 9.6 points. All US flights leaving 8am–11am ran 83.9%.
- 5–8am—
- 8–11am89.1%
- 11am–2pm86.9%
- 2–5pm79.5%
- 5–8pm—
- 8pm–5am84.7%
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 19 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 72.3% on time, 19 points below November, the best at 90.8%. 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 146 flights.
Across the week, Wednesday is the strongest day at 88.8% on time and Monday the weakest at 81.8%, a spread of 7 points.
Delay causes
Why this route gets delayed
Carrier accounts for 55% of the 11,000 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 26%Late-arriving aircraft
- 13%National Airspace System
- 5%Extreme weather
- 0%Security
The largest share of delay minutes, 55%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 6,222 of the 11,000 delay minutes reported here. The split is drawn from 11,258 reported delay minutes.
Cancellations sit at 1.85% against a national 1.89%, which is ordinary. Diversions add another 0.14%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 4.8% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 432 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 8am–11am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 89.4% on time across 1,408 flights, 5 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 5 points of difference.
The sample behind these figures is 1,408 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 DAY 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. November runs 90.8% on time and July 72.3%, a swing of 19 points. If the dates move at all, move them out of July before you think about anything else. 1,380 completed flights over 12 months sit behind that.
Common questions
ATL to DAY questions
How often is ATL to DAY delayed?
About one flight in seven arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 15.1% of the 1,408 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 55 minutes on average.
How reliable is ATL to DAY compared with the rest of the country?
84.9% of flights arrive on time here against a national 77.3%, a difference of 8 points in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on ATL to DAY?
The 8am–11am departure window is the strongest at 89.1% on time. The 2pm–5pm window is the weakest at 79.5%, 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 July delays on ATL to DAY?
July is the weakest month at 72.3% on time, compared with 90.8% in November. Across the year that is 19 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
- DAY to ATL — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- ATL to LGA, a related route72.3%
- ORD to DAY, a related route66.2%
- ATL to MCO, a related route70.3%
- Delta Air Lines on-time record84.9%
- The best time of day to fly, according to 7.05 million flight records
- Worst months to fly in the US, ranked by the data
Direction matters. ATL to DAY and DAY 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.