Route reliability record
ATL→JAX
Atlanta to Jacksonville
- Flights
- 4,076
- Period
- September 2025 to August 2026
- Distance
- 269 mi
- Carriers
- 2
This route sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 4,076 ATL to JAX flights, with a median arrival 3 minutes early.
Best time to fly ATL to JAX: a 5am–8am departure, ideally on a Wednesday. Flights in that window arrived on time 90.9% of the time and Wednesday flights 85.0%, against 75.1% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
75.1%
Arrivals under 15 minutes late, of 4,006 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
1.59%
National rate is 1.89%
Best carrier
Delta
76.4% on time across 3,845 flights
These figures cover 4,076 flights between September 2025 and August 2026. The median arrival is 3 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 JAX
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 | 3,845 | 76.4% | 56 min | 1.59% | B |
| Frontier Airlinesthin sample | 231 | 52.2% | 60 min | 1.73% | F |
Flight by flight
Flights on ATL to JAX
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 matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against half a point between the best and worst carrier.
- 5am–8am252 flights90.9%
- 8am–11am615 flights87.1%
- 11am–2pm629 flights82.7%
- 2pm–5pm933 flights69.4%
- 5pm–8pm664 flights67.8%
- 8pm–5am983 flights69.0%
Scale runs 60% to 95%.
Book the early departure. Flights leaving between 5am–8am arrive on time 90.9% of the time, against 67.8% for the evening window. That is 23 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 983 flights scheduled in it.
Explore
Filter ATL to JAX 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 JAX, the best departure window is 5am–8am at 90.9% on time and the worst is 5pm–8pm at 67.8%, a wide gap of 23.1 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am90.9%
- 8–11am87.1%
- 11am–2pm82.7%
- 2–5pm69.4%
- 5–8pm67.8%
- 8pm–5am69.0%
best all US flightsScale 60% to 95%.
Across the year
When delays peak on this route
This route's year swings by 22 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.
August is the worst month at 62.9% on time, 22 points below September, the best at 85.1%. 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. July was the busiest month here, with 382 flights.
Across the week, Wednesday is the strongest day at 85.0% on time and Sunday the weakest at 67.7%, a spread of 17 points.
Delay causes
Why this route gets delayed
Carrier accounts for 49% of the 56,000 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 30%Late-arriving aircraft
- 18%National Airspace System
- 4%Extreme weather
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 27,000 of the 56,000 delay minutes reported here. The split is drawn from 56,260 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 90.9% on time here.
Cancellations sit at 1.59% against a national 1.89%, which is ordinary. Diversions add another 0.12%.
Connections and stage length
What a delay here actually costs
7.6% 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.
At 269 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 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 83.8% on time across 4,077 flights, 9 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 9 points of difference.
The sample behind these figures is 4,076 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 JAX 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 85.1% on time and August 62.9%, a swing of 22 points. If the dates move at all, move them out of August before you think about anything else. 4,006 completed flights over 12 months sit behind that.
Common questions
ATL to JAX questions
How often is ATL to JAX 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 24.9% of the 4,076 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
How reliable is ATL to JAX compared with the rest of the country?
75.1% of flights arrive on time here against a national 77.3%, a difference of 2 points against it. That is worth a B on this site's grading scale.
What time of day has the fewest delays on ATL to JAX?
The 5am–8am departure window is the strongest at 90.9% on time. The 5pm–8pm window is the weakest at 67.8%, 23 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 August delays on ATL to JAX?
August is the weakest month at 62.9% on time, compared with 85.1% in September. Across the year that is 22 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
- JAX to ATL — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Jacksonville International (JAX) delay statistics
- Delta Air Lines on ATL to JAX76.4%
- Frontier Airlines on ATL to JAX52.2%
- ATL to LGA, a related route72.3%
- ORD to JAX, a related route73.2%
- ATL to MCO, a related route70.3%
- Delta Air Lines on-time record76.4%
- Frontier Airlines on-time record52.2%
- 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 JAX and JAX 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.