Flight number record
DL 1384
Delta Air Lines · Buffalo to Atlanta
- Route
- BUF → ATL
- Departs
- 12:06
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1384, check with Delta Air Lines.
DL 1384 lands a B, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by roughly 50 minutes on average. That rests on 365 flights, with a median arrival 9 minutes early.
Set against the rest of the country, DL 1384's record is 6 points better than the US average of 77.3%. That gap is worth roughly 58 fewer late arrivals for every thousand flights.
Key figures
On time
83.1%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
2.19%
National rate is 1.89%
1 hour+ late
4.8%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 9 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 1384 flies
DL 1384 flies BUF to ATL without a single fixed slot. Its most common scheduled departure was 12:06, used on 59 of 365 flights, with 12:16 (56 flights) and 12:14 (44 flights) next.
- Departs 12:0659 flights16.2%
- Departs 12:1656 flights15.3%
- Departs 12:1444 flights12.1%
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 12:06 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 1384 runs 5 points better at 83.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 1384 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 1384 is 3 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 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1384 | 365 | 83.1% | 49 min | 2.19% | B |
| 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 1384 quarter by quarter
DL 1384 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jul–Sep 2026 at 69.5%, a swing of 31 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 flights100.0%
- Oct–Dec 202592 flights85.6%
- Jan–Mar 202690 flights79.3%
- Apr–Jun 202691 flights87.6%
- Jul–Sep 202662 flights69.5%
Scale runs 60% to 100%.
By weekday, DL 1384 ranged from 78.4% on Sunday to 90.2% on Thursday. 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 1384 runs when it is late
DL 1384 often beats the schedule: 134 of 355 completed flights, 38%, arrived 15 minutes or more early. The 60 late arrivals split 21 under half an hour, 22 between 30 and 60 minutes, and 17 an hour or more.
- 15+ min early134 flights37.7%
- Within 15 min161 flights45.4%
- 15–29 min late21 flights5.9%
- 30–59 min late22 flights6.2%
- 1–2 hours late15 flights4.2%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
17 of 69 late departures made up the time and arrived on time, 25% of them. 8 flights left on time and still arrived late.
The worst days
Worst days for DL 1384
The latest arrival of the period was on 17 February 2026, 3 hours 8 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 February 2026 | 3 hours 8 minutes | Late-arriving aircraft |
| 7 December 2025 | 2 hours 30 minutes | Late-arriving aircraft |
| 16 March 2026 | 1 hour 59 minutes | Late-arriving aircraft |
| 20 July 2026 | 1 hour 59 minutes | Carrier |
| 14 July 2026 | 1 hour 56 minutes | Late-arriving aircraft |
Delay causes
Why DL 1384 runs late
Late-arriving aircraft accounts for 51% of the 2,929 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Late-arriving aircraft
- 34%Carrier
- 13%National Airspace System
- 2%Extreme weather
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,929 reported delay minutes here, that single category outweighs weather by 20 to one. The split is drawn from 2,929 delay minutes reported on DL 1384.
Cancellations sit at 2.19% against a national 1.89%, which is ordinary. Diversions add another 0.55%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 4.8% 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.
DL 1384 is not only a BUF to ATL flight. It also flew ATL to BUF (365 flights, 87.1% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| ATL to BUF | 365 | 87.1% | 43 min | 1.92% | A |
What to do with this
Booking DL 1384
For a booking, read DL 1384 as 83.1% 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 2664 on the same route86.5%
- 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
- Why the first flight of the morning is statistically safest
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.