Flight number record

DL 439

Delta Air Lines · Dallas-Fort Worth to Los Angeles

Route: DFW → LAX
Departs: 06:15
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 439, check with Delta Air Lines.

DL 439 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 close to two hours. That rests on 365 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 439's record is 15 points better than the US average of 77.6%. That gap is worth roughly 145 fewer late arrivals for every thousand flights.

On time

92.1%

Arrivals under 15 minutes late, of 354 completed flights

Avg delay

112 min

Across delayed arrivals only, not all flights

Cancelled

3.01%

National rate is 1.81%

1 hour+ late

4.2%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 8 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 439 flies

DL 439 flies DFW to LAX without a single fixed slot. Its most common scheduled departure was 06:15, used on 168 of 365 flights, with 06:40 (60 flights) and 06:45 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:15168 flights46.0%
Departs 06:4060 flights16.4%
Departs 06:4538 flights10.4%

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 06:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 439 runs 3 points better at 92.1%. 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 439 next to DFW to LAX

Every carrier on DFW to LAX combined arrived on time 72.1% of the time across 6,238 flights, so DL 439 is 20 points ahead of it. Delta flew 718 flights on the same city pair under all its flight numbers, including this one, and those ran 87.9% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 11 points.

DL 439 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 439	365	92.1%	112 min	3.01%	A−
All Delta Air Lines on DFW–LAX	718	87.9%	106 min	1.95%	A
All carriers on DFW–LAX	6,238	72.1%	70 min	2.34%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 439 quarter by quarter

Quarter by quarter DL 439 held fairly steady: 90.1% in Jul–Sep 2025, 94.4% in Oct–Dec 2025, 94.0% in Jan–Mar 2026 and 90.0% 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 flights90.1%
Oct–Dec 202592 flights94.4%
Jan–Mar 202690 flights94.0%
Apr–Jun 202691 flights90.0%

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

By weekday, DL 439 did best on Thursday at 100.0% on time and worst on Friday at 86.3%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 439 runs late

One category carries most of the weight here. Carrier accounts for 57% of the 3,128 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
57%
Extreme weather
23%
Late-arriving aircraft
12%
National Airspace System
8%

Extreme weather accounts for 23% 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 3.7 times the usual weather exposure. The split is drawn from 3,128 delay minutes reported on DL 439.

Cancellations run at 3.01%, against 1.81% nationally. That is roughly one flight in 30 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 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 1,235 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.

Every one of the 365 flights under DL 439 in the data flew DFW to LAX. 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. 365 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 439

For a booking, the cancellation rate is the figure to plan around on DL 439: 3.01% of its 365 scheduled flights did not operate. A late arrival costs close to two hours, 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures