Flight number record
DL 2664
Delta Air Lines · Buffalo to Atlanta
- Route
- BUF → ATL
- Departs
- 06:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2664, check with Delta Air Lines.
DL 2664 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 365 flights, with a median arrival 8 minutes early.
Set against the rest of the country, DL 2664's record is 9 points better than the US average of 77.3%. That gap is worth roughly 92 fewer late arrivals for every thousand flights.
Key figures
On time
86.5%
Arrivals under 15 minutes late, of 356 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
2.19%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 8 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 2664 flies
DL 2664 flies BUF to ATL without a single fixed slot. Its most common scheduled departure was 06:00, used on 282 of 365 flights.
- Departs 06:00282 flights77.3%
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 2664 runs 3 points worse at 86.5%. 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 2664 next to BUF to ATL
Every carrier on BUF to ATL combined arrived on time 80.4% of the time across 1,533 flights, so DL 2664 is 6 points ahead of it. Delta flew 1,254 flights on the same city pair under all its flight numbers, including this one, and those ran 83.6% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2664 | 365 | 86.5% | 54 min | 2.19% | A |
| All Delta Air Lines on BUF–ATL | 1,254 | 83.6% | 56 min | 1.91% | B |
| All carriers on BUF–ATL | 1,533 | 80.4% | 69 min | 2.02% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2664 quarter by quarter
DL 2664 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Oct–Dec 2025 at 80.2%, a swing of 17 points on roughly 73 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 flights96.7%
- Oct–Dec 202592 flights80.2%
- Jan–Mar 202690 flights82.6%
- Apr–Jun 202691 flights92.0%
- Jul–Sep 202662 flights88.5%
Scale runs 70% to 100%.
By weekday, DL 2664 ranged from 80.4% on Sunday to 92.3% on Wednesday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 2664 runs when it is late
DL 2664 often beats the schedule: 109 of 356 completed flights, 31%, arrived 15 minutes or more early. Most of the lateness is short. 26 of the 48 late arrivals were under half an hour behind, and 9 reached an hour or more.
- 15+ min early109 flights30.6%
- Within 15 min199 flights55.9%
- 15–29 min late26 flights7.3%
- 30–59 min late13 flights3.7%
- 1–2 hours late5 flights1.4%
- 2+ hours late4 flights1.1%
Scale runs 0% to 100%.
Share of 356 completed flights by arrival against schedule.
A late pushback is often recovered here: of 45 departures that left 15 minutes late or more, 16 still arrived on time. In the other direction, 19 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 ATL.
The worst days
Worst days for DL 2664
The latest arrival of the period was on 18 February 2026, 6 hours 34 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On four of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 February 2026 | 6 hours 34 minutes | Late-arriving aircraft |
| 1 February 2026 | 4 hours 22 minutes | Carrier |
| 3 March 2026 | 4 hours 9 minutes | Carrier |
| 1 December 2025 | 2 hours 12 minutes | Carrier |
| 4 July 2026 | 1 hour 59 minutes | Carrier |
Delay causes
Why DL 2664 runs late
Carrier accounts for 59% of the 2,586 delay minutes carriers reported here, and the remaining four split what is left.
- 59%Carrier
- 22%National Airspace System
- 15%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 59%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,513 of the 2,586 delay minutes reported here. The split is drawn from 2,586 delay minutes reported on DL 2664.
Cancellations sit at 2.19% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.5% 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 712 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 365 flights under DL 2664 in the data flew BUF to ATL. 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. 365 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 2664
For a booking, read DL 2664 as 86.5% on time with 2.19% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BUF to ATL, every carrier and departure
- ATL to BUF, the return direction
- Delta Air Lines 1384 on the same route83.1%
- 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.