Flight number record
DL 2127
Delta Air Lines · Washington to Atlanta
- Route
- IAD → ATL
- Departs
- 06:00
- Flights
- 299
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2127, check with Delta Air Lines.
DL 2127 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 close to two hours. That rests on 299 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 2127's record is 11 points better than the US average of 77.3%. That gap is worth roughly 107 fewer late arrivals for every thousand flights.
Key figures
On time
88.0%
Arrivals under 15 minutes late, of 292 completed flights
Avg delay
111 min
Across delayed arrivals only, not all flights
Cancelled
2.34%
National rate is 1.89%
1 hour+ late
4.1%
National rate is 8.3%
These figures cover 299 flights between September 2025 and August 2026. The median arrival is 13 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 DL 2127 flies
DL 2127 flies IAD to ATL without a single fixed slot. Its most common scheduled departure was 06:00, used on 216 of 299 flights, with 06:01 (36 flights) and 06:08 (31 flights) next.
- Departs 06:00216 flights72.2%
- Departs 06:0136 flights12.0%
- Departs 06:0831 flights10.4%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2127 runs level with that at 88.0%. 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
DL 2127 next to IAD to ATL
Every carrier on IAD to ATL combined arrived on time 78.0% of the time across 4,003 flights, so DL 2127 is 10 points ahead of it. Delta flew 2,233 flights on the same city pair under all its flight numbers, including this one, and those ran 79.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2127thin sample | 299 | 88.0% | 111 min | 2.34% | A |
| All Delta Air Lines on IAD–ATL | 2,233 | 79.9% | 94 min | 2.82% | B |
| All carriers on IAD–ATL | 4,003 | 78.0% | 86 min | 2.32% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2127 quarter by quarter
DL 2127 did not run the same all year. Its best quarter was Apr–Jun 2026 at 96.7% on time and its weakest Jan–Mar 2026 at 79.5%, a swing of 17 points on roughly 75 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 202528 flights—
- Oct–Dec 202570 flights82.6%
- Jan–Mar 202648 flights79.5%
- Apr–Jun 202691 flights96.7%
- Jul–Sep 202662 flights83.6%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2127 did best on Wednesday at 95.2% on time and worst on Sunday at 82.5%. Each day rests on about 43 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2127 runs when it is late
DL 2127 often beats the schedule: 134 of 292 completed flights, 46%, arrived 15 minutes or more early. The 35 late arrivals split 12 under half an hour, 11 between 30 and 60 minutes, and 12 an hour or more.
- 15+ min early134 flights45.9%
- Within 15 min123 flights42.1%
- 15–29 min late12 flights4.1%
- 30–59 min late11 flights3.8%
- 1–2 hours late5 flights1.7%
- 2+ hours late7 flights2.4%
Scale runs 0% to 100%.
Share of 292 completed flights by arrival against schedule.
5 of 28 late departures made up the time and arrived on time, 18% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 2127
The latest arrival of the period was on 20 March 2026, 17 hours 48 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 20 March 2026 | 17 hours 48 minutes | Carrier |
| 10 July 2026 | 13 hours 5 minutes | Carrier |
| 27 January 2026 | 3 hours 27 minutes | Carrier |
| 19 March 2026 | 3 hours 26 minutes | Carrier |
| 12 December 2025 | 3 hours 23 minutes | Late-arriving aircraft |
Delay causes
Why DL 2127 runs late
Carrier accounts for 77% of the 3,893 delay minutes carriers reported here, and the remaining four split what is left.
- 77%Carrier
- 15%National Airspace System
- 5%Late-arriving aircraft
- 4%Extreme weather
The largest share of delay minutes, 77%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,996 of the 3,893 delay minutes reported here. The split is drawn from 3,893 delay minutes reported on DL 2127.
Cancellations sit at 2.34% 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 4.1% 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 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.
The same number turns up on two other city pairs in the data, including SLC to PHX (13) and PHX to SLC (13), but none flew often enough under DL 2127 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IAD to ATL only.
One caution: this is a thin sample. 299 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 2127
For a booking, read DL 2127 as 88.0% on time with 2.34% cancelled over 299 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- IAD to ATL, every carrier and departure
- ATL to IAD, the return direction
- Delta Air Lines 1695 on the same route71.8%
- Frontier Airlines 4707 on the same route69.1%
- United Airlines 471 on the same route84.7%
- United Airlines 2081 on the same route68.5%
- United Airlines 2739 on the same route89.2%
- Delta Air Lines 1444 on the same route80.3%
- Washington Dulles International (IAD) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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
- Worst months to fly in the US, ranked by the data
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.