Flight number record

AA 1604

American Airlines · San Antonio to Miami

Route: SAT → MIA
Departs: 05:00
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s AA 1604, check with American Airlines.

AA 1604 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 15 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 365 flights, with a median arrival 11 minutes early.

Set against the rest of the country, AA 1604's record is 15 points better than the US average of 77.6%. That gap is worth roughly 154 fewer late arrivals for every thousand flights.

On time

93.0%

Arrivals under 15 minutes late, of 356 completed flights

Avg delay

101 min

Across delayed arrivals only, not all flights

Cancelled

1.64%

National rate is 1.81%

1 hour+ late

2.8%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 11 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.

Schedule

When AA 1604 flies

AA 1604 flies SAT to MIA without a single fixed slot. Its most common scheduled departure was 05:00, used on 87 of 365 flights, with 05:20 (47 flights) and 05:25 (44 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:0087 flights23.8%
Departs 05:2047 flights12.9%
Departs 05:2544 flights12.1%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 05:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and AA 1604 runs 4 points better at 93.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

AA 1604 next to SAT to MIA

Every carrier on SAT to MIA combined arrived on time 87.4% of the time across 509 flights, so AA 1604 is 6 points ahead of it. Across its whole network American Airlines managed 74.4%, which this flight beats by 19 points.

AA 1604 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
AA 1604	365	93.0%	101 min	1.64%	A
All American Airlines on SAT–MIA	399	90.0%	108 min	1.50%	A
All carriers on SAT–MIA	509	87.4%	89 min	1.18%	A
American Airlines, whole network	986,297	74.4%	85 min	2.29%	C

Across the year

AA 1604 quarter by quarter

Quarter by quarter AA 1604 held fairly steady: 92.0% in Jul–Sep 2025, 95.6% in Oct–Dec 2025, 95.4% in Jan–Mar 2026 and 89.0% in Apr–Jun 2026. A spread of 7 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights92.0%
Oct–Dec 202592 flights95.6%
Jan–Mar 202690 flights95.4%
Apr–Jun 202691 flights89.0%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, AA 1604 ranged from 88.5% on Saturday to 100.0% on Tuesday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why AA 1604 runs late

One category carries most of the weight here. Carrier accounts for 45% of the 2,514 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.

Carrier
45%
Late-arriving aircraft
25%
Extreme weather
22%
National Airspace System
8%

Extreme weather accounts for 22% 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 quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.6 times the usual weather exposure. The split is drawn from 2,514 delay minutes reported on AA 1604.

Cancellations sit at 1.64% against a national 1.81%, which is ordinary. Diversions add another 0.82%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.8% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

The 1,143 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.

Every one of the 365 flights under AA 1604 in the data flew SAT to MIA. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 365 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 AA 1604

For a booking, read AA 1604 as 93.0% on time with 1.64% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.

Where to go next

A flight number here means American Airlines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

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.

Key figures