Flight number record
DL 2549
Delta Air Lines · Atlanta to Washington
- Route
- ATL → IAD
- Departs
- 22:53
- Flights
- 329
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2549, check with Delta Air Lines.
DL 2549 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 5 points worse than the national rate of 77.3%. The late ones land close to two hours behind schedule. That rests on 329 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so DL 2549 runs 5 points behind the country as a whole. Across a thousand flights that is about 45 extra late arrivals.
Key figures
On time
72.8%
Arrivals under 15 minutes late, of 320 completed flights
Avg delay
111 min
Across delayed arrivals only, not all flights
Cancelled
2.74%
National rate is 1.89%
1 hour+ late
11.2%
National rate is 8.3%
These figures cover 329 flights between September 2025 and August 2026. Beyond the headline rate, 11.2% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Schedule
When DL 2549 flies
DL 2549 flies ATL to IAD without a single fixed slot. Its most common scheduled departure was 22:53, used on 57 of 329 flights, with 22:45 (56 flights) next.
- Departs 22:5357 flights17.3%
- Departs 22:4556 flights17.0%
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 22:53 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 2549 runs 3 points better at 72.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 2549 next to ATL to IAD
Every carrier on ATL to IAD combined arrived on time 76.4% of the time across 4,005 flights, so DL 2549 is 4 points behind it. Delta flew 2,233 flights on the same city pair under all its flight numbers, including this one, and those ran 77.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 8 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2549thin sample | 329 | 72.8% | 111 min | 2.74% | C |
| All Delta Air Lines on ATL–IAD | 2,233 | 77.8% | 76 min | 2.73% | B |
| All carriers on ATL–IAD | 4,005 | 76.4% | 79 min | 2.12% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2549 quarter by quarter
DL 2549 did not run the same all year. Its best quarter was Apr–Jun 2026 at 83.5% on time and its weakest Jul–Sep 2026 at 54.2%, a swing of 29 points on roughly 82 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 202529 flights—
- Oct–Dec 202558 flights71.4%
- Jan–Mar 202689 flights70.6%
- Apr–Jun 202691 flights83.5%
- Jul–Sep 202662 flights54.2%
Scale runs 45% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2549 did best on Wednesday at 80.0% on time and worst on Sunday at 62.2%. Each day rests on about 47 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2549 runs when it is late
The 87 late arrivals split 24 under half an hour, 27 between 30 and 60 minutes, and 36 an hour or more.
- 15+ min early36 flights11.3%
- Within 15 min197 flights61.6%
- 15–29 min late24 flights7.5%
- 30–59 min late27 flights8.4%
- 1–2 hours late24 flights7.5%
- 2+ hours late12 flights3.8%
Scale runs 0% to 100%.
Share of 320 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 79 departures that left 15 minutes late or more, only 4 made it up before arrival. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 2549
The latest arrival of the period was on 24 February 2026, 16 hours 57 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 February 2026 | 16 hours 57 minutes | Carrier |
| 22 August 2026 | 12 hours 20 minutes | Carrier |
| 12 August 2026 | 12 hours 7 minutes | Carrier |
| 5 May 2026 | 11 hours 39 minutes | Carrier |
| 19 March 2026 | 10 hours 48 minutes | Carrier |
Delay causes
Why DL 2549 runs late
Carrier accounts for 78% of the 9,621 delay minutes carriers reported here, and the remaining four split what is left.
- 78%Carrier
- 15%Late-arriving aircraft
- 7%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 78%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 7,471 of the 9,621 delay minutes reported here. The split is drawn from 9,621 delay minutes reported on DL 2549.
Cancellations run at 2.74%, against 1.89% nationally. That is roughly one flight in 40 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
11.2% 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 534 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.
Every one of the 329 flights under DL 2549 in the data flew ATL to IAD. 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. 329 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 DL 2549
For a booking, the cancellation rate is the figure to plan around on DL 2549: 2.74% of its 329 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to IAD, every carrier and departure
- IAD to ATL, the return direction
- United Airlines 1831 on the same route76.2%
- Delta Air Lines 1695 on the same route75.6%
- United Airlines 632 on the same route87.0%
- United Airlines 2634 on the same route76.6%
- Delta Air Lines 1309 on the same route72.6%
- Delta Air Lines 1444 on the same route87.6%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Washington Dulles International (IAD) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
A flight number here means Delta Air Lines’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.