Route reliability record
LGA→ATL
New York to Atlanta
- Flights
- 8,343
- Period
- July 2025 to June 2026
- Distance
- 762 mi
- Carriers
- 5
This route carries a cancellation problem, not just a delay problem: 3.7% of scheduled flights never operate, against 1.8% nationally. Of the ones that do fly, close to three flights in four arrive on time, worth a B− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 8,343 flights, of which Delta Air Lines flew 4,933 at 79.9% on time.
Delta Air Lines is the most reliable of the four carriers covered here at 79.9% on time across 4,933 flights.
Key figures
On time
76.6%
Arrivals under 15 minutes late, of 8,020 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
3.67%
National rate is 1.81%
Best carrier
Delta
79.9% on time across 4,933 flights
These figures cover 8,343 flights between July 2025 and June 2026. Beyond the headline rate, 9.3% 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 LGA to ATL
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 79.9% of the time; Frontier Airlines manages 58.4%. Sample sizes sit next to every figure, because a two-point gap across 889 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Spirit Airlinesthin sample | 10 | 80.0% | 101 min | 0.00% | B+ |
| Delta Air Lines | 4,933 | 79.9% | 73 min | 2.98% | B |
| Republic Airways | 1,576 | 77.8% | 64 min | 4.70% | B− |
| Southwest Airlines | 935 | 73.6% | 78 min | 3.64% | C− |
| Frontier Airlines | 889 | 58.4% | 106 min | 5.74% | D− |
Frontier Airlines cancels 5.7% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
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 22 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,461 flights83.8%
- 8am–11am1,358 flights86.4%
- 11am–2pm1,887 flights80.0%
- 2pm–5pm1,460 flights73.2%
- 5pm–8pm1,485 flights65.1%
- 8pm–5am692 flights63.9%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 63.9% on time, against 86.4% for the 8am–11am 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. The 11am–2pm window is the busiest, with 1,887 flights scheduled in it.
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.
December is the weak month at 67.6% on time, against 87.7% 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. October was the busiest month here, with 798 flights.
Across the week, Wednesday is the strongest day at 79.9% on time and Sunday the weakest at 69.1%. 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. Late-arriving aircraft accounts for 44% of the 146,000 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%Late-arriving aircraft
- 29%Carrier
- 26%National Airspace System
- 1%Extreme weather
- 0%Security
44% 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 146,000 reported delay minutes here, that single category outweighs weather by 44 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 split is drawn from 146,064 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 86.4% on time here.
Cancellations run at 3.67%, against 1.81% nationally. That is roughly one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
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. 9.3% of arrivals land a full hour or more behind schedule, against 8.1% 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 762 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 is a different operation and performs like one: it runs 73.4% on time across 8,344 flights, 3 points below 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 3 points of difference.
The sample behind these figures is 8,343 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 delay figures matter less here than the 3.67% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 8,020 completed flights over 12 months sit behind that.
Common questions
LGA to ATL questions
How often is LGA to ATL delayed?
About one flight in four arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 23.4% of the 8,343 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on LGA to ATL?
Delta Air Lines leads at 79.9% on time across 4,933 flights. Frontier Airlines is at the other end on 58.4%, a gap of 22 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 LGA to ATL?
The 8am–11am departure window is the strongest at 86.4% on time. The 8pm–5am window is the weakest at 63.9%, 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 December delays on LGA to ATL?
December is the weakest month at 67.6% on time, compared with 87.7% 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 LGA — the return legseparate record
- LaGuardia (LGA) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Spirit Airlines on-time record80.0%
- Delta Air Lines on-time record79.9%
- Republic Airways on-time record77.8%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Direction matters. LGA to ATL and ATL to LGA 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, July 2025 to June 2026. Updated monthly. How this data is collected.