Flight number record
DL 766
Delta Air Lines · Detroit to Las Vegas
- Route
- DTW → LAS
- Departs
- 16:35
- Flights
- 360
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 766, check with Delta Air Lines.
DL 766 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 360 flights, with a median arrival 1 minute early.
The national on-time rate over the same period is 77.3%, so DL 766 runs 7 points behind the country as a whole. Across a thousand flights that is about 65 extra late arrivals.
Key figures
On time
70.8%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
11.4%
National rate is 8.3%
These figures cover 360 flights between September 2025 and August 2026. Beyond the headline rate, 11.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 766 flies
DL 766 flies DTW to LAS without a single fixed slot. Its most common scheduled departure was 16:35, used on 81 of 360 flights, with 16:25 (52 flights) and 16:55 (39 flights) next.
- Departs 16:3581 flights22.5%
- Departs 16:2552 flights14.4%
- Departs 16:5539 flights10.8%
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 16:35 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 766 runs level with that at 70.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 766 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 766 is 3 points behind 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 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 766thin sample | 360 | 70.8% | 70 min | 0.00% | C+ |
| 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 766 quarter by quarter
DL 766 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jan–Mar 2026 at 63.2%, a swing of 20 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 flights83.3%
- Oct–Dec 202592 flights70.7%
- Jan–Mar 202687 flights63.2%
- Apr–Jun 202689 flights73.0%
- Jul–Sep 202662 flights72.6%
Scale runs 55% to 90%.
By weekday, DL 766 ranged from 65.4% on Sunday to 76.9% on Wednesday. With about 51 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 766 runs when it is late
The 105 late arrivals split 25 under half an hour, 39 between 30 and 60 minutes, and 41 an hour or more.
- 15+ min early63 flights17.5%
- Within 15 min192 flights53.3%
- 15–29 min late25 flights6.9%
- 30–59 min late39 flights10.8%
- 1–2 hours late27 flights7.5%
- 2+ hours late14 flights3.9%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
18 of 102 late departures made up the time and arrived on time, 18% of them. In the other direction, 21 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 766
The latest arrival of the period was on 14 June 2026, 9 hours 6 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 14 June 2026 | 9 hours 6 minutes | National Airspace System |
| 10 May 2026 | 4 hours 6 minutes | Carrier |
| 9 November 2025 | 3 hours 46 minutes | National Airspace System |
| 18 October 2025 | 3 hours 39 minutes | Carrier |
| 15 November 2025 | 3 hours 21 minutes | Carrier |
Delay causes
Why DL 766 runs late
Carrier accounts for 49% of the 7,300 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Carrier
- 30%National Airspace System
- 20%Late-arriving aircraft
- 1%Extreme weather
The largest share of delay minutes, 49%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,557 of the 7,300 delay minutes reported here. The split is drawn from 7,300 delay minutes reported on DL 766.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
11.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
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.
Every one of the 360 flights under DL 766 in the data flew DTW to LAS. 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. 360 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 766
For a booking, read DL 766 as 70.8% on time with 0.00% cancelled over 360 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 334 on the same route79.4%
- Delta Air Lines 421 on the same route72.4%
- 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
- How often a connection fails at the major US hubs
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.