Flight number record
AA 577
American Airlines · Dallas-Fort Worth to Denver
- Route
- DFW → DEN
- Departs
- 21:26
- Flights
- 324
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s AA 577, check with American Airlines.
AA 577 earns an F−, which is as low as this site's scale goes for a reason. Only 51.0% of flights arrive inside the 15-minute window, 27 points worse than the national rate of 77.6%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 324 flights, with a median arrival 13 minutes late.
The national on-time rate over the same period is 77.6%, so AA 577 runs 27 points behind the country as a whole. Across a thousand flights that is about 266 extra late arrivals.
Key figures
On time
51.0%
Arrivals under 15 minutes late, of 306 completed flights
Avg delay
81 min
Across delayed arrivals only, not all flights
Cancelled
5.25%
National rate is 1.81%
1 hour+ late
19.3%
National rate is 8.1%
These figures cover 324 flights between July 2025 and June 2026. Beyond the headline rate, 19.3% 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.
Schedule
When AA 577 flies
AA 577 flies DFW to DEN without a single fixed slot. Its most common scheduled departure was 21:26, used on 67 of 324 flights, with 20:51 (61 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 21:2667 flights20.7%
- Departs 20:5161 flights18.8%
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 21:26 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and AA 577 runs 20 points worse at 51.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
AA 577 next to DFW to DEN
Every carrier on DFW to DEN combined arrived on time 69.4% of the time across 6,025 flights, so AA 577 is 18 points behind it. American flew 2,951 flights on the same city pair under all its flight numbers, including this one, and those ran 61.7% on time. Across its whole network American Airlines managed 74.4%, which this flight trails by 23 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AA 577thin sample | 324 | 51.0% | 81 min | 5.25% | F− |
| All American Airlines on DFW–DEN | 2,951 | 61.7% | 71 min | 3.42% | D− |
| All carriers on DFW–DEN | 6,025 | 69.4% | 75 min | 2.32% | C |
| American Airlines, whole network | 986,297 | 74.4% | 85 min | 2.29% | C |
Across the year
AA 577 quarter by quarter
AA 577 did not run the same all year. Its best quarter was Jan–Mar 2026 at 60.7% on time and its weakest Jul–Sep 2025 at 38.1%, a swing of 23 points on roughly 81 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 202591 flights38.1%
- Oct–Dec 202587 flights57.0%
- Jan–Mar 202666 flights60.7%
- Apr–Jun 202680 flights50.7%
Scale runs 30% to 65%. Rows with fewer than 30 flights show a dash.
By weekday, AA 577 did best on Wednesday at 70.0% on time and worst on Sunday at 28.9%. Each day rests on about 46 flights, so a gap of 41 points is worth noticing but could still narrow in another year.
Delay causes
Why AA 577 runs late
One category carries most of the weight here. Late-arriving aircraft accounts for 58% of the 12,000 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.
- 58%Late-arriving aircraft
- 26%Carrier
- 11%National Airspace System
- 5%Extreme weather
58% 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 12,000 reported delay minutes here, that single category outweighs weather by 11 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 12,147 delay minutes reported on AA 577.
Cancellations run at 5.25%, against 1.81% nationally. That is about one flight in twenty 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 routes
What a delay on this flight costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 19.3% 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 641 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 same number turns up on one other city pair in the data, including PHL to PHX (21), but none flew often enough under AA 577 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DFW to DEN only.
One caution: this is a thin sample. 324 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 577
For a booking, the cancellation rate is the figure to plan around on AA 577: 5.25% of its 324 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- DFW to DEN, every carrier and departure
- DEN to DFW, the return direction
- American Airlines 420 on the same route77.5%
- Frontier Airlines 2147 on the same route90.5%
- American Airlines 1832 on the same route60.3%
- American Airlines 1322 on the same route45.2%
- United Airlines 2049 on the same route84.2%
- American Airlines 1523 on the same route78.5%
- Dallas/Fort Worth International (DFW) delay statistics
- Denver International (DEN) 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
- Why the first flight of the morning is statistically safest
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.