Flight number record

DL 3055

Delta Air Lines · Charleston to Atlanta

Route: CHS → ATL
Departs: 05:15
Flights: 358
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 3055, check with Delta Air Lines.

DL 3055 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 20 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 358 flights, with a median arrival 18 minutes early.

Set against the rest of the country, DL 3055's record is 20 points better than the US average of 77.6%. That gap is worth roughly 195 fewer late arrivals for every thousand flights.

On time

97.1%

Arrivals under 15 minutes late, of 350 completed flights

Avg delay

66 min

Across delayed arrivals only, not all flights

Cancelled

1.96%

National rate is 1.81%

1 hour+ late

1.4%

National rate is 8.1%

These figures cover 358 flights between July 2025 and June 2026. The median arrival is 18 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 3055 flies

DL 3055 flies CHS to ATL without a single fixed slot. Its most common scheduled departure was 05:15, used on 93 of 358 flights, with 05:25 (79 flights) and 05:27 (60 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:1593 flights26.0%
Departs 05:2579 flights22.1%
Departs 05:2760 flights16.8%

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 05:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 3055 runs 8 points better at 97.1%. 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 3055 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 3055 is 7 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 16 points.

DL 3055 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 3055thin sample	358	97.1%	66 min	1.96%	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 3055 quarter by quarter

Quarter by quarter DL 3055 held fairly steady: 98.9% in Jul–Sep 2025, 95.5% in Oct–Dec 2025, 95.2% in Jan–Mar 2026 and 98.8% in Apr–Jun 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights98.9%
Oct–Dec 202590 flights95.5%
Jan–Mar 202689 flights95.2%
Apr–Jun 202687 flights98.8%

Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 3055 ranged from 94.0% on Saturday to 100.0% on Thursday. With about 51 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 3055 runs late

One category carries most of the weight here. Carrier accounts for 93% of the 663 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
93%
National Airspace System
7%

The largest share of delay minutes, 93%, 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 617 of the 663 delay minutes reported here. The split is drawn from 663 delay minutes reported on DL 3055.

Cancellations sit at 1.96% against a national 1.81%, which is ordinary. Diversions add another 0.28%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 1.4% 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.

Every one of the 358 flights under DL 3055 in the data flew CHS to ATL. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 358 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 3055

For a booking, read DL 3055 as 97.1% on time with 1.96% cancelled over 358 flights. Those are rates from the past twelve months, not a forecast for any particular 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