Flight number record

DL 2939

Delta Air Lines · Atlanta to Memphis

Route: ATL → MEM
Departs: 17:45
Flights: 343
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2939, check with Delta Air Lines.

DL 2939 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 343 flights, with a median arrival 5 minutes early.

On time

78.3%

Arrivals under 15 minutes late, of 337 completed flights

Avg delay

67 min

Across delayed arrivals only, not all flights

Cancelled

1.46%

National rate is 1.81%

1 hour+ late

7.4%

National rate is 8.1%

These figures cover 343 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 2939 flies

DL 2939 flies ATL to MEM without a single fixed slot. Its most common scheduled departure was 17:45, used on 59 of 343 flights, with 18:05 (49 flights) and 17:50 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 17:4559 flights17.2%
Departs 18:0549 flights14.3%
Departs 17:5049 flights14.3%

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 17:45 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 2939 runs 10 points better at 78.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 2939 next to ATL to MEM

Every carrier on ATL to MEM combined arrived on time 82.3% of the time across 3,388 flights, so DL 2939 is 4 points behind it. Delta flew 3,304 flights on the same city pair under all its flight numbers, including this one, and those ran 82.6% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 3 points.

DL 2939 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2939thin sample	343	78.3%	67 min	1.46%	B
All Delta Air Lines on ATL–MEM	3,304	82.6%	61 min	1.85%	B
All carriers on ATL–MEM	3,388	82.3%	62 min	1.86%	B
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2939 quarter by quarter

DL 2939 did not run the same all year. Its best quarter was Oct–Dec 2025 at 84.1% on time and its weakest Jul–Sep 2025 at 73.3%, a swing of 11 points on roughly 86 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 202590 flights73.3%
Oct–Dec 202582 flights84.1%
Jan–Mar 202681 flights80.5%
Apr–Jun 202690 flights76.1%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2939 did best on Wednesday at 86.5% on time and worst on Monday at 69.4%. Each day rests on about 49 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2939 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 4,881 reported delay minutes.

Carrier
40%
Late-arriving aircraft
38%
National Airspace System
19%
Extreme weather
4%

38% 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 4,881 reported delay minutes here, that single category outweighs weather by 10 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 4,881 delay minutes reported on DL 2939.

Cancellations sit at 1.46% against a national 1.81%, which is ordinary. Diversions add another 0.29%.

Connections and routes

What a delay on this flight costs

7.4% 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 same number turns up on two other city pairs in the data, including MEM to ATL (170) and ATL to TYS (1), but none flew often enough under DL 2939 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ATL to MEM only.

One caution: this is a thin sample. 343 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 2939

For a booking, read DL 2939 as 78.3% on time with 1.46% cancelled over 343 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