Flight number record
AA 577
American Airlines · Dallas-Fort Worth to Denver
- Route
- DFW → DEN
- Departs
- 21:26
- Flights
- 321
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 51.3% of flights arrive inside the 15-minute window, 26 points worse than the national rate of 77.3%. Late arrivals average a little over an hour. Treat any tight connection here as a coin flip. That rests on 321 flights, with a median arrival 13 minutes late.
The national on-time rate over the same period is 77.3%, so AA 577 runs 26 points behind the country as a whole. Across a thousand flights that is about 260 extra late arrivals.
Key figures
On time
51.3%
Arrivals under 15 minutes late, of 308 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
3.74%
National rate is 1.89%
1 hour+ late
16.9%
National rate is 8.3%
These figures cover 321 flights between September 2025 and August 2026. Beyond the headline rate, 16.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 321 flights, with 20:51 (61 flights) and 20:29 (52 flights) next.
- Departs 21:2667 flights20.9%
- Departs 20:5161 flights19.0%
- Departs 20:2952 flights16.2%
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 21:26 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and AA 577 runs 19 points worse at 51.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
AA 577 next to DFW to DEN
Every carrier on DFW to DEN combined arrived on time 70.5% of the time across 6,059 flights, so AA 577 is 19 points behind it. American flew 2,935 flights on the same city pair under all its flight numbers, including this one, and those ran 62.7% on time. Across its whole network American Airlines managed 74.7%, which this flight trails by 23 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| AA 577thin sample | 321 | 51.3% | 68 min | 3.74% | F− |
| All American Airlines on DFW–DEN | 2,935 | 62.7% | 69 min | 2.90% | D |
| All carriers on DFW–DEN | 6,059 | 70.5% | 75 min | 1.93% | C |
| American Airlines, whole network | 988,892 | 74.7% | 85 min | 2.14% | 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 2026 at 37.9%, a swing of 23 points on roughly 80 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 202530 flights—
- Oct–Dec 202587 flights57.0%
- Jan–Mar 202666 flights60.7%
- Apr–Jun 202680 flights50.7%
- Jul–Sep 202658 flights37.9%
Scale runs 30% to 65%. Rows with fewer than 30 flights show a dash.
By weekday, AA 577 did best on Wednesday at 64.1% on time and worst on Sunday at 37.0%. Each day rests on about 46 flights, so a gap of 27 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late AA 577 runs when it is late
The 150 late arrivals split 46 under half an hour, 52 between 30 and 60 minutes, and 52 an hour or more.
- 15+ min early26 flights8.4%
- Within 15 min132 flights42.9%
- 15–29 min late46 flights14.9%
- 30–59 min late52 flights16.9%
- 1–2 hours late30 flights9.7%
- 2+ hours late22 flights7.1%
Scale runs 0% to 100%.
Share of 308 completed flights by arrival against schedule.
24 of 161 late departures made up the time and arrived on time, 15% of them. 13 flights left on time and still arrived late.
The worst days
Worst days for AA 577
The latest arrival of the period was on 5 May 2026, 9 hours 37 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across May, April, July and June, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 May 2026 | 9 hours 37 minutes | Extreme weather |
| 12 April 2026 | 7 hours 54 minutes | Carrier |
| 22 July 2026 | 4 hours 41 minutes | Late-arriving aircraft |
| 22 June 2026 | 3 hours 53 minutes | Late-arriving aircraft |
| 1 June 2026 | 3 hours 43 minutes | Carrier |
Delay causes
Why AA 577 runs late
Late-arriving aircraft accounts for 52% of the 10,000 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Late-arriving aircraft
- 30%Carrier
- 13%National Airspace System
- 6%Extreme weather
52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 10,000 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 10,196 delay minutes reported on AA 577.
Cancellations run at 3.74%, against 1.89% nationally. That is about one flight in 25 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
16.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection 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.
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. 321 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: 3.74% of its 321 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 route74.7%
- American Airlines 1832 on the same route60.0%
- Frontier Airlines 2147 on the same route90.7%
- American Airlines 1322 on the same route47.4%
- United Airlines 248 on the same route81.8%
- United Airlines 2049 on the same route84.3%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.