Route reliability record
ATL→EWR
Atlanta to Newark
- Flights
- 63,813
- Period
- June 2025 to May 2026
- Distance
- 745 mi
- Carriers
- 1
This route sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 75.9%. The late ones land about an hour behind schedule. That rests on 63,813 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 75.9%, so this route runs 7 points behind the country as a whole. Across a thousand flights that is about 71 extra late arrivals.
Key figures
On time
68.8%
Arrivals under 15 minutes late, of 62,504 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
1.90%
National rate is 2.23%
Best carrier
Mesa
68.8% on time across 63,813 flights
These figures cover 64,000 flights between June 2025 and May 2026. Beyond the headline rate, 12.8% 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 ATL to EWR
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 |
|---|---|---|---|---|---|
| Mesa Airlines | 63,813 | 68.8% | 58 min | 1.90% | C |
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 10 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am9,891 flights73.8%
- 8am–11am13,082 flights69.8%
- 11am–2pm11,805 flights65.3%
- 2pm–5pm11,167 flights67.8%
- 5pm–8pm11,486 flights63.8%
- 8pm–5am6,381 flights69.3%
Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 63.8% on time, against 73.8% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in.
Across the year
When delays peak on this route
This route's year swings by 12 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 61.3% on time, 12 points below September, the best at 73.3%. 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.
The day of the week is close to irrelevant here: 2 points separates the best day from the worst. Weekly demand peaks are not what drives the delays on this operation.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 1.16 million reported delay minutes.
- 34%Late-arriving aircraft
- 29%National Airspace System
- 22%Carrier
- 15%Extreme weather
- 0%Security
Extreme weather accounts for 15% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 8%, so this operation carries roughly 1.9 times the usual weather exposure.
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 1.16 million reported delay minutes here, that single category outweighs weather by 2 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.
Cancellations sit at 1.90% against a national 2.23%, which is ordinary. Diversions add another 0.15%.
Connections and stage length
What a delay here actually costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 12.8% of arrivals land a full hour or more behind schedule, against 8.6% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
The 745 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 68.7% on time across 11,263 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
63,813 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.
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 73.3% on time and July 61.3%, a swing of 12 points. If the dates move at all, move them out of July before you think about anything else.
Common questions
ATL to EWR questions
How often is ATL to EWR delayed?
About one flight in three arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 31.2% of the 63,813 flights in this analysis, against 24.1% nationally. Delayed flights are late by about an hour on average.
How reliable is ATL to EWR compared with the rest of the country?
68.8% of flights arrive on time here against a national 75.9%, a difference of 7 points against it. That is worth a C on this site's grading scale.
What time of day has the fewest delays on ATL to EWR?
The 5am–8am departure window is the strongest at 73.8% on time. The 5pm–8pm window is the weakest at 63.8%, 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 EWR?
July is the weakest month at 61.3% on time, compared with 73.3% in September. Across the year that is 12 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
- EWR to ATL — the return legseparate record
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Newark Liberty International (EWR) delay statistics
- Mesa Airlines on-time record68.8%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 11.3 million flight records
Direction matters. ATL to EWR and EWR to ATL 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.