Flight number record
DL 1617
Delta Air Lines · Atlanta to Greensboro
- Route
- ATL → GSO
- Departs
- 20:57
- Flights
- 291
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1617, check with Delta Air Lines.
DL 1617 lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That rests on 291 flights, with a median arrival 4 minutes early.
Key figures
On time
79.9%
Arrivals under 15 minutes late, of 284 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
2.41%
National rate is 1.89%
1 hour+ late
5.6%
National rate is 8.3%
These figures cover 291 flights between September 2025 and August 2026. The median arrival is 4 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 1617 flies
DL 1617 flies ATL to GSO without a single fixed slot. Its most common scheduled departure was 20:57, used on 42 of 291 flights.
- Departs 20:5742 flights14.4%
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 20:57 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1617 runs 10 points better at 79.9%. 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
DL 1617 next to ATL to GSO
Every carrier on ATL to GSO combined arrived on time 83.7% of the time across 2,730 flights, so DL 1617 is 4 points behind it. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1617thin sample | 291 | 79.9% | 53 min | 2.41% | B |
| All Delta Air Lines on ATL–GSO | 2,730 | 83.7% | 59 min | 1.94% | B |
| All carriers on ATL–GSO | 2,730 | 83.7% | 59 min | 1.94% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1617 quarter by quarter
DL 1617 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 55.6%, a swing of 34 points on roughly 58 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 flights90.0%
- Oct–Dec 202577 flights82.9%
- Jan–Mar 202670 flights84.8%
- Apr–Jun 202677 flights80.3%
- Jul–Sep 202637 flights55.6%
Scale runs 45% to 95%.
By weekday, DL 1617 did best on Monday at 88.6% on time and worst on Sunday at 70.7%. Each day rests on about 42 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1617 runs when it is late
The 57 late arrivals split 22 under half an hour, 19 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early42 flights14.8%
- Within 15 min185 flights65.1%
- 15–29 min late22 flights7.7%
- 30–59 min late19 flights6.7%
- 1–2 hours late13 flights4.6%
- 2+ hours late3 flights1.1%
Scale runs 0% to 100%.
Share of 284 completed flights by arrival against schedule.
8 of 58 late departures made up the time and arrived on time, 14% of them. 7 flights left on time and still arrived late.
The worst days
Worst days for DL 1617
The latest arrival of the period was on 7 December 2025, 4 hours 21 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 December 2025 | 4 hours 21 minutes | Late-arriving aircraft |
| 11 July 2026 | 3 hours 10 minutes | Carrier |
| 10 July 2026 | 2 hours 3 minutes | Late-arriving aircraft |
| 18 July 2026 | 1 hour 59 minutes | Carrier |
| 28 April 2026 | 1 hour 58 minutes | Carrier |
Delay causes
Why DL 1617 runs late
Carrier accounts for 49% of the 3,014 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 39%Late-arriving aircraft
- 8%National Airspace System
- 4%Extreme weather
39% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,014 reported delay minutes here, that single category outweighs weather by 10 to one. The split is drawn from 3,014 delay minutes reported on DL 1617.
Cancellations sit at 2.41% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
5.6% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last roughly 55 minutes, which a normal layover absorbs.
The same number turns up on two other city pairs in the data, including ATL to BNA (16) and BNA to ATL (16), but none flew often enough under DL 1617 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to GSO only.
One caution: this is a thin sample. 291 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 1617
For a booking, read DL 1617 as 79.9% on time with 2.41% cancelled over 291 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to GSO, every carrier and departure
- GSO to ATL, the return direction
- Delta Air Lines 3005 on the same route83.0%
- Delta Air Lines 2539 on the same route85.9%
- 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.