Flight number record
DL 1670
Delta Air Lines · Atlanta to Fort Lauderdale
- Route
- ATL → FLL
- Departs
- 17:45
- Flights
- 255
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1670, check with Delta Air Lines.
DL 1670 draws a D. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 255 flights, with a median arrival 7 minutes late.
The national on-time rate over the same period is 77.3%, so DL 1670 runs 16 points behind the country as a whole. Across a thousand flights that is about 164 extra late arrivals.
Key figures
On time
60.9%
Arrivals under 15 minutes late, of 248 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
2.35%
National rate is 1.89%
1 hour+ late
11.7%
National rate is 8.3%
These figures cover 255 flights between September 2025 and August 2026. Beyond the headline rate, 11.7% 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 1670 flies
DL 1670 is scheduled to leave Atlanta (ATL) at 17:45 local time and reach Fort Lauderdale (FLL) at 19:34. That slot held for 254 of the 255 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 17:45254 flights99.6%
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 17:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1670 runs 7 points worse at 60.9%. 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 1670 next to ATL to FLL
Every carrier on ATL to FLL combined arrived on time 70.7% of the time across 7,371 flights, so DL 1670 is 10 points behind it. Delta flew 4,383 flights on the same city pair under all its flight numbers, including this one, and those ran 73.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 20 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1670thin sample | 255 | 60.9% | 62 min | 2.35% | D |
| All Delta Air Lines on ATL–FLL | 4,383 | 73.9% | 57 min | 1.78% | C |
| All carriers on ATL–FLL | 7,371 | 70.7% | 66 min | 2.46% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1670 quarter by quarter
DL 1670 did not run the same all year. Its best quarter was Jan–Mar 2026 at 68.2% on time and its weakest Jul–Sep 2026 at 42.6%, a swing of 26 points on roughly 85 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.
- Oct–Dec 202512 flights—
- Jan–Mar 202690 flights68.2%
- Apr–Jun 202691 flights67.8%
- Jul–Sep 202662 flights42.6%
Scale runs 35% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1670 did best on Tuesday at 77.1% on time and worst on Sunday at 36.1%. Each day rests on about 36 flights, so a gap of 41 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1670 runs when it is late
The 97 late arrivals split 26 under half an hour, 42 between 30 and 60 minutes, and 29 an hour or more.
- 15+ min early35 flights14.1%
- Within 15 min116 flights46.8%
- 15–29 min late26 flights10.5%
- 30–59 min late42 flights16.9%
- 1–2 hours late16 flights6.5%
- 2+ hours late13 flights5.2%
Scale runs 0% to 100%.
Share of 248 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 86 departures that left 15 minutes late or more, only 7 made it up before arrival. In the other direction, 18 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 FLL.
The worst days
Worst days for DL 1670
The latest arrival of the period was on 6 March 2026, 5 hours 45 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across March, June, August, July and December, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 March 2026 | 5 hours 45 minutes | Extreme weather |
| 14 June 2026 | 4 hours 37 minutes | National Airspace System |
| 11 August 2026 | 3 hours 38 minutes | Carrier |
| 3 July 2026 | 3 hours 18 minutes | Late-arriving aircraft |
| 27 December 2025 | 3 hours 15 minutes | Late-arriving aircraft |
Delay causes
Why DL 1670 runs late
Carrier accounts for 43% of the 5,979 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Carrier
- 26%Late-arriving aircraft
- 23%National Airspace System
- 8%Extreme weather
The largest share of delay minutes, 43%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,588 of the 5,979 delay minutes reported here. The split is drawn from 5,979 delay minutes reported on DL 1670.
Cancellations sit at 2.35% against a national 1.89%, which is ordinary. Diversions add another 0.39%.
Connections and routes
What a delay on this flight costs
11.7% 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 581 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 five other city pairs in the data, including FLL to ATL (138), PVD to DTW (34) and DTW to PVD (34), but none flew often enough under DL 1670 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to FLL only.
One caution: this is a thin sample. 255 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 1670
For a booking, DL 1670 is one of the weaker ways to fly ATL to FLL: 10 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- ATL to FLL, every carrier and departure
- FLL to ATL, the return direction
- Delta Air Lines 1512 on the same route82.0%
- Delta Air Lines 1341 on the same route73.7%
- Delta Air Lines 1489 on the same route65.2%
- Delta Air Lines 2345 on the same route65.9%
- Delta Air Lines 1295 on the same route67.3%
- Delta Air Lines 1334 on the same route90.8%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Fort Lauderdale-Hollywood International (FLL) 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
- How often a connection fails at the major US hubs
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.