Flight number record
AA 1259
American Airlines · Boston to Miami
- Route
- BOS → MIA
- Departs
- 08:00
- Flights
- 311
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s AA 1259, check with American Airlines.
AA 1259 earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 311 flights, with a median arrival 16 minutes early.
Set against the rest of the country, AA 1259's record is 11 points better than the US average of 77.3%. That gap is worth roughly 113 fewer late arrivals for every thousand flights.
Key figures
On time
88.6%
Arrivals under 15 minutes late, of 306 completed flights
Avg delay
74 min
Across delayed arrivals only, not all flights
Cancelled
1.61%
National rate is 1.89%
1 hour+ late
4.2%
National rate is 8.3%
These figures cover 311 flights between September 2025 and August 2026. The median arrival is 16 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.
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Schedule
When AA 1259 flies
AA 1259 flies BOS to MIA without a single fixed slot. Its most common scheduled departure was 08:00, used on 157 of 311 flights, with 07:00 (72 flights) next.
- Departs 08:00157 flights50.5%
- Departs 07:0072 flights23.2%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and AA 1259 runs 5 points better at 88.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
AA 1259 next to BOS to MIA
Every carrier on BOS to MIA combined arrived on time 78.0% of the time across 3,368 flights, so AA 1259 is 11 points ahead of it. American flew 2,271 flights on the same city pair under all its flight numbers, including this one, and those ran 82.3% on time. Across its whole network American Airlines managed 74.7%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AA 1259thin sample | 311 | 88.6% | 74 min | 1.61% | A |
| All American Airlines on BOS–MIA | 2,271 | 82.3% | 77 min | 1.72% | B |
| All carriers on BOS–MIA | 3,368 | 78.0% | 78 min | 2.17% | B |
| American Airlines, whole network | 988,892 | 74.7% | 85 min | 2.14% | C |
Across the year
AA 1259 quarter by quarter
AA 1259 did not run the same all year. Its best quarter was Apr–Jun 2026 at 93.6% on time and its weakest Oct–Dec 2025 at 83.5%, a swing of 10 points on roughly 78 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202526 flights—
- Oct–Dec 202592 flights83.5%
- Jan–Mar 202685 flights87.7%
- Apr–Jun 202647 flights93.6%
- Jul–Sep 202661 flights90.2%
Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, AA 1259 did best on Wednesday at 100.0% on time and worst on Sunday at 77.8%. Each day rests on about 44 flights, so a gap of 22 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AA 1259 runs when it is late
AA 1259 often beats the schedule: 157 of 306 completed flights, 51%, arrived 15 minutes or more early. The 35 late arrivals split 16 under half an hour, 6 between 30 and 60 minutes, and 13 an hour or more.
- 15+ min early157 flights51.3%
- Within 15 min114 flights37.3%
- 15–29 min late16 flights5.2%
- 30–59 min late6 flights2.0%
- 1–2 hours late8 flights2.6%
- 2+ hours late5 flights1.6%
Scale runs 0% to 100%.
Share of 306 completed flights by arrival against schedule.
A late pushback is often recovered here: of 25 departures that left 15 minutes late or more, 8 still arrived on time. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at MIA.
The worst days
Worst days for AA 1259
The latest arrival of the period was on 9 December 2025, 6 hours 47 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 9 December 2025 | 6 hours 47 minutes | Carrier |
| 31 May 2026 | 5 hours 46 minutes | Late-arriving aircraft |
| 8 November 2025 | 3 hours 42 minutes | National Airspace System |
| 4 January 2026 | 3 hours 30 minutes | Carrier |
| 19 October 2025 | 2 hours 28 minutes | Carrier |
Delay causes
Why AA 1259 runs late
Carrier accounts for 54% of the 2,574 delay minutes carriers reported here, and the remaining four split what is left.
- 54%Carrier
- 31%National Airspace System
- 13%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 54%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,390 of the 2,574 delay minutes reported here. The split is drawn from 2,574 delay minutes reported on AA 1259.
Cancellations sit at 1.61% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.2% land an hour or more behind schedule, against 8.3% 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 1,258 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.
The same number turns up on one other city pair in the data, including DTW to ORD (43), but none flew often enough under AA 1259 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to MIA only.
One caution: this is a thin sample. 311 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 1259
For a booking, read AA 1259 as 88.6% on time with 1.61% cancelled over 311 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BOS to MIA, every carrier and departure
- MIA to BOS, the return direction
- Delta Air Lines 776 on the same route63.1%
- Delta Air Lines 1399 on the same route84.0%
- American Airlines 2980 on the same route92.7%
- Boston Logan International (BOS) delay statistics
- Miami International (MIA) delay statistics
- American Airlines on-time record
- Every American Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.