Carrier route record
AAMIA→JAX
American Airlines · Miami to Jacksonville
- Flights
- 805
- Period
- July 2025 to June 2026
- Share of route
- 53%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with American Airlines.
American on MIA to JAX draws a C+. About one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 805 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.6%, so American on MIA to JAX runs 12 points behind the country as a whole. Across a thousand flights that is about 124 extra late arrivals.
Key figures
On time
65.2%
Arrivals under 15 minutes late, of 797 completed flights
Avg delay
67 min
Across delayed arrivals only, not all flights
Cancelled
0.99%
National rate is 1.81%
Whole route
74.1%
Every carrier on MIA to JAX, 1,526 flights
These figures cover 805 flights between July 2025 and June 2026. Beyond the headline rate, 12.2% 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 MIA to JAX
American flew 805 of the 1,526 flights on MIA to JAX, most of the route. Its 65.2% on time is 9 points worse than the route as a whole, which runs 74.1%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Envoy at 84.3% to American at 65.2%. 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 |
|---|---|---|---|---|---|
| Envoy Air | 701 | 84.3% | 49 min | 0.71% | B+ |
| Republic Airwaysthin sample | 20 | 70.0% | 63 min | 0.00% | C+ |
| American Airlines (this page) | 805 | 65.2% | 67 min | 0.99% | C+ |
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 35 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–8am60 flights85.0%
- 8am–11am60 flights91.7%
- 11am–2pm1 flights—
- 2pm–5pm105 flights72.1%
- 5pm–8pm135 flights56.5%
- 8pm–5am444 flights59.9%
Scale runs 50% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 56.5% on time, against 91.7% 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 8pm–5am window is the busiest, with 444 flights scheduled in it.
Across the year
American on MIA to JAX through the year
June is the worst month at 52.6% on time, 29 points below November, the best at 81.8%. 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. March was the busiest month here, with 89 flights.
Across the week, Wednesday is the strongest day at 76.1% on time and Sunday the weakest at 44.0%. 32 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 47% of the 19,000 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.
- 47%Late-arriving aircraft
- 37%Carrier
- 11%National Airspace System
- 5%Extreme weather
47% 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 19,000 reported delay minutes here, that single category outweighs weather by 10 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 18,621 reported delay minutes.
The largest share of delay minutes, 37%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 6,946 of the 19,000 delay minutes reported here.
Cancellations sit at 0.99% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
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. 12.2% 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.
At 335 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 80.2% on time across 803 flights, 15 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 15 points of difference.
One caution: this is a thin sample. 805 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking American on MIA to JAX
Put together: treat all of this as provisional. 805 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 65.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 797 completed flights over 12 months sit behind that.
Related
Where to go next
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.