Flight number record

DL 1664

Delta Air Lines · Charleston to Atlanta

Route: CHS → ATL
Departs: 08:00
Flights: 313
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. When something does go wrong the average delay runs an hour and a half. That rests on 313 flights, with a median arrival 12 minutes early.

Set against the rest of the country, DL 1664's record is 15 points better than the US average of 77.6%. That gap is worth roughly 147 fewer late arrivals for every thousand flights.

On time

92.3%

Arrivals under 15 minutes late, of 311 completed flights

Avg delay

97 min

Across delayed arrivals only, not all flights

Cancelled

0.64%

National rate is 1.81%

1 hour+ late

4.2%

National rate is 8.1%

These figures cover 313 flights between July 2025 and June 2026. The median arrival is 12 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.

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 98 of 313 flights, with 07:30 (64 flights) and 07:25 (52 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:0098 flights31.3%
Departs 07:3064 flights20.4%
Departs 07:2552 flights16.6%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 84.1%, and DL 1664 runs 8 points better at 92.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 1664 next to CHS to ATL

Every carrier on CHS to ATL combined arrived on time 90.2% of the time across 3,213 flights, so DL 1664 is 2 points ahead of it. Delta flew 3,210 flights on the same city pair under all its flight numbers, including this one, and those ran 90.2% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 11 points.

DL 1664 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1664thin sample	313	92.3%	97 min	0.64%	A+
All Delta Air Lines on CHS–ATL	3,210	90.2%	78 min	1.65%	A
All carriers on CHS–ATL	3,213	90.2%	78 min	1.65%	A
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1664 quarter by quarter

Quarter by quarter DL 1664 held fairly steady: 94.6% in Jul–Sep 2025, 88.8% in Oct–Dec 2025, 91.8% in Jan–Mar 2026 and 93.6% in Apr–Jun 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights94.6%
Oct–Dec 202580 flights88.8%
Jan–Mar 202662 flights91.8%
Apr–Jun 202679 flights93.6%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1664 did best on Thursday at 97.8% on time and worst on Sunday at 81.4%. Each day rests on about 45 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 1664 runs late

One category carries most of the weight here. Carrier accounts for 58% of the 2,329 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Carrier
58%
National Airspace System
36%
Late-arriving aircraft
4%
Extreme weather
2%

The largest share of delay minutes, 58%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,353 of the 2,329 delay minutes reported here. The split is drawn from 2,329 delay minutes reported on DL 1664.

Cancellations are rare at 0.64%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.2% land an hour or more behind schedule, against 8.1% 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 one other city pair in the data, including FLL to JFK (12), 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. 313 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: 92.3% on time and 0.64% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures