Flight number record
DL 1664
Delta Air Lines · Charleston to Atlanta
- Route
- CHS → ATL
- Departs
- 08:00
- Flights
- 284
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1664, check with Delta Air Lines.
DL 1664 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 15 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 284 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 1664's record is 15 points better than the US average of 77.3%. That gap is worth roughly 149 fewer late arrivals for every thousand flights.
Key figures
On time
92.2%
Arrivals under 15 minutes late, of 281 completed flights
Avg delay
103 min
Across delayed arrivals only, not all flights
Cancelled
1.06%
National rate is 1.89%
1 hour+ late
4.3%
National rate is 8.3%
These figures cover 284 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 1664 flies
DL 1664 flies CHS to ATL without a single fixed slot. Its most common scheduled departure was 08:00, used on 79 of 284 flights, with 07:20 (53 flights) and 07:25 (46 flights) next.
- Departs 08:0079 flights27.8%
- Departs 07:2053 flights18.7%
- Departs 07:2546 flights16.2%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1664 runs 8 points better at 92.2%. 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 1664 next to CHS to ATL
Every carrier on CHS to ATL combined arrived on time 88.9% of the time across 3,234 flights, so DL 1664 is 3 points ahead of it. Delta flew 3,231 flights on the same city pair under all its flight numbers, including this one, and those ran 89.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1664thin sample | 284 | 92.2% | 103 min | 1.06% | A |
| All Delta Air Lines on CHS–ATL | 3,231 | 89.0% | 79 min | 1.73% | A |
| All carriers on CHS–ATL | 3,234 | 88.9% | 79 min | 1.73% | A |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1664 quarter by quarter
DL 1664 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Oct–Dec 2025 at 88.8%, a swing of 11 points on roughly 57 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 202580 flights88.8%
- Jan–Mar 202662 flights91.8%
- Apr–Jun 202679 flights93.6%
- Jul–Sep 202633 flights90.6%
Scale runs 80% to 100%.
By weekday, DL 1664 did best on Thursday at 100.0% on time and worst on Sunday at 82.1%. Each day rests on about 41 flights, so a gap of 18 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1664 runs when it is late
DL 1664 often beats the schedule: 120 of 281 completed flights, 43%, arrived 15 minutes or more early. When DL 1664 is late it tends to be very late: 12 of its 22 late arrivals were an hour or more behind, and 5 were two hours or more.
- 15+ min early120 flights42.7%
- Within 15 min139 flights49.5%
- 15–29 min late4 flights1.4%
- 30–59 min late6 flights2.1%
- 1–2 hours late7 flights2.5%
- 2+ hours late5 flights1.8%
Scale runs 0% to 100%.
Share of 281 completed flights by arrival against schedule.
3 of 21 late departures made up the time and arrived on time, 14% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for DL 1664
The latest arrival of the period was on 17 October 2025, 7 hours 46 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 October 2025 | 7 hours 46 minutes | Carrier |
| 28 April 2026 | 5 hours 16 minutes | National Airspace System |
| 7 December 2025 | 3 hours 38 minutes | National Airspace System |
| 8 December 2025 | 2 hours 27 minutes | Carrier |
| 18 July 2026 | 2 hours 12 minutes | Carrier |
Delay causes
Why DL 1664 runs late
Carrier accounts for 64% of the 2,264 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Carrier
- 36%National Airspace System
The largest share of delay minutes, 64%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,452 of the 2,264 delay minutes reported here. The split is drawn from 2,264 delay minutes reported on DL 1664.
Cancellations sit at 1.06% 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 4.3% 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 same number turns up on two other city pairs in the data, including FLL to JFK (12) and ATL to ABE (4), but none flew often enough under DL 1664 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to CHS to ATL only.
One caution: this is a thin sample. 284 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 1664
For a booking, DL 1664 has one of the better records a US domestic flight can show: 92.2% on time and 1.06% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- CHS to ATL, every carrier and departure
- ATL to CHS, the return direction
- Delta Air Lines 2124 on the same route93.0%
- Delta Air Lines 3091 on the same route92.7%
- Delta Air Lines 2179 on the same route83.8%
- Delta Air Lines 3055 on the same route96.2%
- Delta Air Lines 3107 on the same route89.5%
- Delta Air Lines 1381 on the same route81.2%
- Charleston International (CHS) 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.