Flight number record
DL 439
Delta Air Lines · Dallas-Fort Worth to Los Angeles
- Route
- DFW → LAX
- Departs
- 06:15
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. 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 77.3%. That gap is worth roughly 148 fewer late arrivals for every thousand flights.
Key figures
On time
92.1%
Arrivals under 15 minutes late, of 355 completed flights
Avg delay
110 min
Across delayed arrivals only, not all flights
Cancelled
2.74%
National rate is 1.89%
1 hour+ late
4.5%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 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.
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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 106 of 365 flights, with 06:40 (60 flights) and 06:45 (38 flights) next.
- Departs 06:15106 flights29.0%
- Departs 06:4060 flights16.4%
- Departs 06:4538 flights10.4%
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 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.
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Against the route
DL 439 next to DFW to LAX
Every carrier on DFW to LAX combined arrived on time 74.0% of the time across 6,184 flights, so DL 439 is 18 points ahead of it. Delta flew 757 flights on the same city pair under all its flight numbers, including this one, and those ran 89.2% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 439 | 365 | 92.1% | 110 min | 2.74% | A |
| All Delta Air Lines on DFW–LAX | 757 | 89.2% | 95 min | 1.59% | A |
| All carriers on DFW–LAX | 6,184 | 74.0% | 67 min | 2.15% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 439 quarter by quarter
Quarter by quarter DL 439 held fairly steady: 86.7% in Jul–Sep 2025, 94.4% in Oct–Dec 2025, 94.0% in Jan–Mar 2026, 90.0% in Apr–Jun 2026 and 91.9% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights86.7%
- Oct–Dec 202592 flights94.4%
- Jan–Mar 202690 flights94.0%
- Apr–Jun 202691 flights90.0%
- Jul–Sep 202662 flights91.9%
Scale runs 80% to 100%.
By weekday, DL 439 ranged from 88.2% on Friday to 98.0% on Thursday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 439 runs when it is late
DL 439 often beats the schedule: 108 of 355 completed flights, 30%, arrived 15 minutes or more early. When DL 439 is late it tends to be very late: 16 of its 28 late arrivals were an hour or more behind, and 10 were two hours or more.
- 15+ min early108 flights30.4%
- Within 15 min219 flights61.7%
- 15–29 min late8 flights2.3%
- 30–59 min late4 flights1.1%
- 1–2 hours late6 flights1.7%
- 2+ hours late10 flights2.8%
Scale runs 0% to 100%.
Share of 355 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 26 departures that left 15 minutes late or more, only 3 made it up before arrival. Only 5 left on time and still arrived late.
The worst days
Worst days for DL 439
The latest arrival of the period was on 9 June 2026, 9 hours 25 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 9 June 2026 | 9 hours 25 minutes | Carrier |
| 11 May 2026 | 6 hours 33 minutes | Late-arriving aircraft |
| 4 January 2026 | 3 hours 30 minutes | Carrier |
| 20 May 2026 | 3 hours 23 minutes | Carrier |
| 24 November 2025 | 3 hours 15 minutes | Extreme weather |
Delay causes
Why DL 439 runs late
Carrier accounts for 57% of the 3,086 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Carrier
- 24%Extreme weather
- 12%Late-arriving aircraft
- 7%National Airspace System
Extreme weather accounts for 24% 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 4.0 times the usual weather exposure. The split is drawn from 3,086 delay minutes reported on DL 439.
Cancellations run at 2.74%, against 1.89% nationally. That is roughly one flight in 40 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 4.5% 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 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.
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: 2.74% 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.
Related
Where to go next
- DFW to LAX, every carrier and departure
- LAX to DFW, the return direction
- Delta Air Lines 948 on the same route85.6%
- Dallas/Fort Worth International (DFW) delay statistics
- Los Angeles International (LAX) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
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 ; recomputed monthly. How this data is collected.