Flight number record

DL 1667

Delta Air Lines · Salt Lake City to Denver

Route: SLC → DEN
Departs: 20:59
Flights: 265
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 1667, check with Delta Air Lines.

DL 1667 lands a B+, about a point worse than the national rate of 77.6%. About one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 265 flights, with a median arrival 6 minutes early.

On time

76.5%

Arrivals under 15 minutes late, of 264 completed flights

Avg delay

62 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

8.0%

National rate is 8.1%

These figures cover 265 flights between July 2025 and June 2026. Beyond the headline rate, 8.0% 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 1667 flies

DL 1667 flies SLC to DEN without a single fixed slot. Its most common scheduled departure was 20:59, used on 52 of 265 flights, with 20:55 (43 flights) and 21:15 (34 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 20:5952 flights19.6%
Departs 20:5543 flights16.2%
Departs 21:1534 flights12.8%

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 20:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 1667 runs 6 points better at 76.5%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

DL 1667 next to SLC to DEN

Every carrier on SLC to DEN combined arrived on time 77.8% of the time across 7,757 flights, so DL 1667 is about level with it. Delta flew 1,690 flights on the same city pair under all its flight numbers, including this one, and those ran 79.4% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 5 points.

DL 1667 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 1667thin sample	265	76.5%	62 min	0.00%	B+
All Delta Air Lines on SLC–DEN	1,690	79.4%	64 min	0.24%	B+
All carriers on SLC–DEN	7,757	77.8%	61 min	0.55%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 1667 quarter by quarter

DL 1667 did not run the same all year. Its best quarter was Apr–Jun 2026 at 83.1% on time and its weakest Jul–Sep 2025 at 64.8%, a swing of 18 points on roughly 66 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 202571 flights64.8%
Oct–Dec 202571 flights78.6%
Jan–Mar 202640 flights80.0%
Apr–Jun 202683 flights83.1%

Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 1667 ranged from 71.7% on Sunday to 81.4% on Monday. With about 38 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.

Delay causes

Why DL 1667 runs late

One category carries most of the weight here. Carrier accounts for 59% of the 3,854 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
59%
Late-arriving aircraft
27%
National Airspace System
15%

The largest share of delay minutes, 59%, 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 2,258 of the 3,854 delay minutes reported here. The split is drawn from 3,854 delay minutes reported on DL 1667.

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

8.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The same number turns up on one other city pair in the data, including MSP to BZN (24), but none flew often enough under DL 1667 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SLC to DEN only.

One caution: this is a thin sample. 265 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 1667

For a booking, read DL 1667 as 76.5% on time with 0.00% cancelled over 265 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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