Flight number record

DL 2785

Delta Air Lines · Boston to Charleston

Route: BOS → CHS
Departs: 12:55
Flights: 335
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2785, check with Delta Air Lines.

DL 2785 lands a B, level with the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 335 flights, with a median arrival 5 minutes early.

On time

78.3%

Arrivals under 15 minutes late, of 327 completed flights

Avg delay

68 min

Across delayed arrivals only, not all flights

Cancelled

2.39%

National rate is 1.81%

1 hour+ late

7.0%

National rate is 8.1%

These figures cover 335 flights between July 2025 and June 2026. The median arrival is 5 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 2785 flies

DL 2785 flies BOS to CHS without a single fixed slot. Its most common scheduled departure was 12:55, used on 58 of 335 flights, with 12:30 (56 flights) and 12:50 (39 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 12:5558 flights17.3%
Departs 12:3056 flights16.7%
Departs 12:5039 flights11.6%

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 12:55 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 2785 runs level with that at 78.3%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 2785 next to BOS to CHS

Every carrier on BOS to CHS combined arrived on time 77.2% of the time across 1,130 flights, so DL 2785 is about level with it. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 3 points.

DL 2785 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2785thin sample	335	78.3%	68 min	2.39%	B
All Delta Air Lines on BOS–CHS	390	78.0%	73 min	2.31%	B
All carriers on BOS–CHS	1,130	77.2%	68 min	1.77%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2785 quarter by quarter

DL 2785 did not run the same all year. Its best quarter was Apr–Jun 2026 at 88.4% on time and its weakest Oct–Dec 2025 at 67.5%, a swing of 21 points on roughly 84 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 202592 flights82.4%
Oct–Dec 202580 flights67.5%
Jan–Mar 202676 flights72.9%
Apr–Jun 202687 flights88.4%

Scale runs 60% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2785 did best on Wednesday at 83.3% on time and worst on Sunday at 68.8%. Each day rests on about 48 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2785 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 4,819 reported delay minutes.

Carrier
42%
Late-arriving aircraft
36%
National Airspace System
21%
Extreme weather
2%

36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,819 reported delay minutes here, that single category outweighs weather by 15 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,819 delay minutes reported on DL 2785.

Cancellations sit at 2.39% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

7.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The 818 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

DL 2785 is not only a BOS to CHS flight. It also flew CHS to BOS (294 flights, 66.9% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 335 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.

Other routes flown as DL 2785
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
CHS to BOSthin sample	294	66.9%	81 min	3.40%	C−

What to do with this

Booking DL 2785

For a booking, read DL 2785 as 78.3% on time with 2.39% cancelled over 335 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