Flight number record

DL 766

Delta Air Lines · Detroit to Las Vegas

Route: DTW → LAS
Departs: 16:34
Flights: 360
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. 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 77.6%, so DL 766 runs 7 points behind the country as a whole. Across a thousand flights that is about 68 extra late arrivals.

On time

70.8%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

70 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

11.1%

National rate is 8.1%

These figures cover 360 flights between July 2025 and June 2026. Beyond the headline rate, 11.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 766 flies

DL 766 flies DTW to LAS without a single fixed slot. Its most common scheduled departure was 16:34, used on 56 of 360 flights, with 16:25 (52 flights) and 16:35 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:3456 flights15.6%
Departs 16:2552 flights14.4%
Departs 16:3549 flights13.6%

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 16:34 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, 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.

Against the route

DL 766 next to DTW to LAS

Every carrier on DTW to LAS combined arrived on time 76.1% of the time across 2,843 flights, so DL 766 is 5 points behind it. Delta flew 1,897 flights on the same city pair under all its flight numbers, including this one, and those ran 75.9% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 11 points.

DL 766 against its route and carrier
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	1,897	75.9%	60 min	0.53%	B+
All carriers on DTW–LAS	2,843	76.1%	56 min	0.49%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	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 75.8% on time and its weakest Jan–Mar 2026 at 63.2%, a swing of 13 points on roughly 90 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 202592 flights75.8%
Oct–Dec 202592 flights70.7%
Jan–Mar 202687 flights63.2%
Apr–Jun 202689 flights73.0%

Scale runs 55% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, DL 766 ranged from 67.3% on Sunday to 74.5% on Thursday. With about 51 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 766 runs late

One category carries most of the weight here. Carrier accounts for 50% of the 7,306 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
50%
National Airspace System
30%
Late-arriving aircraft
17%
Extreme weather
3%

The largest share of delay minutes, 50%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 3,667 of the 7,306 delay minutes reported here. The split is drawn from 7,306 delay minutes reported on DL 766.

Cancellations are rare at 0.00%, below the national 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 11.1% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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, DL 766 is one of the weaker ways to fly DTW to LAS: 5 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.

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