Carrier route record
AAJFK→MIA
American Airlines · New York to Miami
- Flights
- 2,659
- Period
- July 2025 to June 2026
- Share of route
- 58%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with American Airlines.
American on JFK to MIA lands a B, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 2,659 flights, with a median arrival 10 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate American on JFK to MIA from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
77.8%
Arrivals under 15 minutes late, of 2,579 completed flights
Avg delay
103 min
Across delayed arrivals only, not all flights
Cancelled
2.71%
National rate is 1.81%
Whole route
77.3%
Every carrier on JFK to MIA, 4,553 flights
These figures cover 2,659 flights between July 2025 and June 2026. Beyond the headline rate, 11.1% 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
American against every carrier on JFK to MIA
American flew 2,659 of the 4,553 flights on JFK to MIA, most of the route. Its 77.8% on time is about level with the route as a whole at 77.3%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Frontier at 79.4% to Delta at 76.1%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
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 |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 274 | 79.4% | 112 min | 2.55% | B |
| American Airlines (this page) | 2,659 | 77.8% | 103 min | 2.71% | B |
| Delta Air Lines | 1,620 | 76.1% | 74 min | 3.21% | B− |
Flight by flight
American flight numbers on JFK to MIA
Departure window
When American runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 21 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–8am719 flights89.6%
- 8am–11am207 flights79.6%
- 11am–2pm399 flights77.4%
- 2pm–5pm452 flights76.5%
- 5pm–8pm738 flights68.5%
- 8pm–5am144 flights68.4%
Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 89.6% of the time, against 68.4% for the overnight window. That is 21 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5pm–8pm window is the busiest, with 738 flights scheduled in it.
Across the year
American on JFK to MIA through the year
July is the worst month at 62.3% on time, 26 points below April, the best at 88.0%. 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. May was the busiest month here, with 270 flights.
Across the week, Wednesday is the strongest day at 81.0% on time and Sunday the weakest at 67.3%. 14 points is a smaller lever than departure hour, but it is free.
Delay causes
Why American runs late on this route
One category carries most of the weight here. Late-arriving aircraft accounts for 48% of the 59,000 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.
- 48%Late-arriving aircraft
- 28%Carrier
- 16%National Airspace System
- 7%Extreme weather
- 1%Security
48% 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 59,000 reported delay minutes here, that single category outweighs weather by 7 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 58,915 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 89.6% on time here.
Cancellations run at 2.71%, against 1.81% nationally. That is about one flight in 40 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 costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.1% 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 1,089 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 70.9% on time across 2,660 flights, 7 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 7 points of difference.
The sample behind these figures is 2,659 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 American on JFK to MIA
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 88.0% on time and July 62.3%, a swing of 26 points. If the dates move at all, move them out of July before you think about anything else. 2,579 completed flights over 12 months sit behind that.
Related
Where to go next
- JFK to MIA, every carrier
- American on MIA to JFK, the return leg
- Frontier Airlines on JFK to MIA79.4%
- Delta Air Lines on JFK to MIA76.1%
- American Airlines network-wide record
- John F. Kennedy International (JFK) delay statistics
- Miami International (MIA) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.