Flight number record

DL 839

Delta Air Lines · Atlanta to Dallas-Fort Worth

Route: ATL → DFW
Departs: 07:25
Flights: 347
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 839, check with Delta Air Lines.

DL 839 lands a B−, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 35 minutes on average. That rests on 347 flights, with a median arrival 1 minute late.

On time

79.8%

Arrivals under 15 minutes late, of 332 completed flights

Avg delay

37 min

Across delayed arrivals only, not all flights

Cancelled

3.75%

National rate is 1.89%

1 hour+ late

1.8%

National rate is 8.3%

These figures cover 347 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.

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Schedule

When DL 839 flies

DL 839 flies ATL to DFW without a single fixed slot. Its most common scheduled departure was 07:25, used on 246 of 347 flights, with 07:40 (42 flights) next.

Departs 07:25246 flights70.9%
Departs 07:4042 flights12.1%

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 07:25 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 839 runs 10 points worse at 79.8%. 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 839 next to ATL to DFW

Every carrier on ATL to DFW combined arrived on time 73.9% of the time across 6,672 flights, so DL 839 is 6 points ahead of it. Delta flew 2,784 flights on the same city pair under all its flight numbers, including this one, and those ran 76.0% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.

DL 839 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 839thin sample	347	79.8%	37 min	3.75%	B−
All Delta Air Lines on ATL–DFW	2,784	76.0%	60 min	2.55%	B
All carriers on ATL–DFW	6,672	73.9%	82 min	2.50%	C
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 839 quarter by quarter

DL 839 did not run the same all year. Its best quarter was Jan–Mar 2026 at 89.6% on time and its weakest Oct–Dec 2025 at 74.4%, a swing of 15 points on roughly 87 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 flights—
Oct–Dec 202592 flights74.4%
Jan–Mar 202682 flights89.6%
Apr–Jun 202687 flights80.5%
Jul–Sep 202656 flights88.9%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 839 did best on Tuesday at 88.2% on time and worst on Saturday at 68.8%. Each day rests on about 50 flights, so a gap of 19 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 839 runs when it is late

Most of the lateness is short. 44 of the 67 late arrivals were under half an hour behind, and 6 reached an hour or more.

15+ min early40 flights12.0%
Within 15 min225 flights67.8%
15–29 min late44 flights13.3%
30–59 min late17 flights5.1%
1–2 hours late2 flights0.6%
2+ hours late4 flights1.2%

Scale runs 0% to 100%.

Share of 332 completed flights by arrival against schedule.

4 of 25 late departures made up the time and arrived on time, 16% of them. In the other direction, 46 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at DFW.

The worst days

Worst days for DL 839

The latest arrival of the period was on 7 December 2025, 3 hours 54 minutes behind schedule; most of its delay minutes were filed as extreme weather. The five worst days are spread across December, November, March, June and February, with no single month standing out.

The latest arrivals of DL 839 in the period
Date	Arrived late by	Largest filed cause
7 December 2025	3 hours 54 minutes	Extreme weather
24 November 2025	2 hours 48 minutes	National Airspace System
10 March 2026	2 hours 41 minutes	Carrier
19 June 2026	2 hours 37 minutes	Extreme weather
16 February 2026	1 hour 13 minutes	Carrier

Delay causes

Why DL 839 runs late

National Airspace System accounts for 58% of the 2,459 delay minutes carriers reported here, and the remaining four split what is left.

National Airspace System
58%
Carrier
28%
Extreme weather
14%

Extreme weather accounts for 14% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.4 times the usual weather exposure. The split is drawn from 2,459 delay minutes reported on DL 839.

Cancellations run at 3.75%, against 1.89% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 1.8% 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 731 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.

DL 839 is not only a ATL to DFW flight. It also flew DFW to ATL (345 flights, 83.7% 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. 347 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 839
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
DFW to ATLthin sample	345	83.7%	58 min	3.48%	B−

What to do with this

Booking DL 839

For a booking, the cancellation rate is the figure to plan around on DL 839: 3.75% of its 347 scheduled flights did not operate. A late arrival costs roughly 35 minutes, but a cancellation costs the day, so leave a later option open.

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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures