Flight number record
DL 334
Delta Air Lines · Detroit to Las Vegas
- Route
- DTW → LAS
- Departs
- 08:59
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 334, check with Delta Air Lines.
DL 334 lands a B+, 2 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 about an hour on average. That rests on 362 flights, with a median arrival 2 minutes early.
Key figures
On time
79.4%
Arrivals under 15 minutes late, of 359 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.83%
National rate is 1.89%
1 hour+ late
4.2%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 2 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 334 flies
DL 334 flies DTW to LAS without a single fixed slot. Its most common scheduled departure was 08:59, used on 118 of 362 flights, with 08:58 (47 flights) and 08:40 (37 flights) next.
- Departs 08:59118 flights32.6%
- Departs 08:5847 flights13.0%
- Departs 08:4037 flights10.2%
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 08:59 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 334 runs 5 points worse at 79.4%. 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 334 next to DTW to LAS
Every carrier on DTW to LAS combined arrived on time 73.6% of the time across 2,768 flights, so DL 334 is 6 points ahead of it. Delta flew 1,880 flights on the same city pair under all its flight numbers, including this one, and those ran 73.8% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 334thin sample | 362 | 79.4% | 57 min | 0.83% | B+ |
| All Delta Air Lines on DTW–LAS | 1,880 | 73.8% | 63 min | 0.59% | C+ |
| All carriers on DTW–LAS | 2,768 | 73.6% | 59 min | 0.61% | C+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 334 quarter by quarter
DL 334 did not run the same all year. Its best quarter was Jul–Sep 2025 at 86.7% on time and its weakest Oct–Dec 2025 at 76.1%, a swing of 11 points on roughly 72 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 flights86.7%
- Oct–Dec 202589 flights76.1%
- Jan–Mar 202690 flights81.1%
- Apr–Jun 202691 flights79.8%
- Jul–Sep 202662 flights77.4%
Scale runs 70% to 90%.
By weekday, DL 334 did best on Wednesday at 86.5% on time and worst on Sunday at 70.6%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 334 runs when it is late
The 74 late arrivals split 33 under half an hour, 26 between 30 and 60 minutes, and 15 an hour or more.
- 15+ min early58 flights16.2%
- Within 15 min227 flights63.2%
- 15–29 min late33 flights9.2%
- 30–59 min late26 flights7.2%
- 1–2 hours late5 flights1.4%
- 2+ hours late10 flights2.8%
Scale runs 0% to 100%.
Share of 359 completed flights by arrival against schedule.
11 of 53 late departures made up the time and arrived on time, 21% of them. In the other direction, 32 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 LAS.
The worst days
Worst days for DL 334
The latest arrival of the period was on 1 January 2026, 5 hours 27 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 |
|---|---|---|
| 1 January 2026 | 5 hours 27 minutes | Carrier |
| 17 June 2026 | 3 hours 49 minutes | Extreme weather |
| 14 July 2026 | 3 hours 46 minutes | Late-arriving aircraft |
| 29 July 2026 | 3 hours 38 minutes | Carrier |
| 12 June 2026 | 3 hours 27 minutes | Carrier |
Delay causes
Why DL 334 runs late
Carrier accounts for 62% of the 4,181 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Carrier
- 26%National Airspace System
- 7%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 62%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,580 of the 4,181 delay minutes reported here. The split is drawn from 4,181 delay minutes reported on DL 334.
Cancellations are rare at 0.83%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
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 8.3% 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.
At 1,749 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on one other city pair in the data, including LAS to DTW (210), but none flew often enough under DL 334 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DTW to LAS only.
One caution: this is a thin sample. 362 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 334
For a booking, read DL 334 as 79.4% on time with 0.83% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- DTW to LAS, every carrier and departure
- LAS to DTW, the return direction
- Delta Air Lines 421 on the same route72.4%
- Delta Air Lines 766 on the same route70.8%
- Delta Air Lines 916 on the same route70.0%
- Delta Air Lines 544 on the same route68.7%
- Detroit Metropolitan Wayne County (DTW) delay statistics
- Harry Reid International (LAS) 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
- Worst months to fly in the US, ranked by the data
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.