Flight number record
DL 1667
Delta Air Lines · Salt Lake City to Denver
- Route
- SLC → DEN
- Departs
- 20:59
- Flights
- 272
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1667, check with Delta Air Lines.
DL 1667 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 272 flights, with a median arrival 8 minutes early.
Key figures
On time
79.7%
Arrivals under 15 minutes late, of 271 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
6.6%
National rate is 8.3%
These figures cover 272 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 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 272 flights, with 21:05 (43 flights) and 20:55 (42 flights) next.
- Departs 20:5952 flights19.1%
- Departs 21:0543 flights15.8%
- Departs 20:5542 flights15.4%
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 20:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 1667 runs 10 points better at 79.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 1667 next to SLC to DEN
Every carrier on SLC to DEN combined arrived on time 79.0% of the time across 7,709 flights, so DL 1667 is about level with it. Delta flew 1,697 flights on the same city pair under all its flight numbers, including this one, and those ran 79.8% on time. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1667thin sample | 272 | 79.7% | 63 min | 0.00% | B+ |
| All Delta Air Lines on SLC–DEN | 1,697 | 79.8% | 64 min | 0.18% | B+ |
| All carriers on SLC–DEN | 7,709 | 79.0% | 61 min | 0.51% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1667 quarter by quarter
Quarter by quarter DL 1667 held fairly steady: 78.6% in Oct–Dec 2025, 80.0% in Jan–Mar 2026, 83.1% in Apr–Jun 2026 and 76.8% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202522 flights—
- Oct–Dec 202571 flights78.6%
- Jan–Mar 202640 flights80.0%
- Apr–Jun 202683 flights83.1%
- Jul–Sep 202656 flights76.8%
Scale runs 70% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1667 ranged from 76.7% on Wednesday to 85.4% on Tuesday. With about 39 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 1667 runs when it is late
DL 1667 often beats the schedule: 83 of 271 completed flights, 31%, arrived 15 minutes or more early. The 55 late arrivals split 15 under half an hour, 22 between 30 and 60 minutes, and 18 an hour or more.
- 15+ min early83 flights30.6%
- Within 15 min133 flights49.1%
- 15–29 min late15 flights5.5%
- 30–59 min late22 flights8.1%
- 1–2 hours late15 flights5.5%
- 2+ hours late3 flights1.1%
Scale runs 0% to 100%.
Share of 271 completed flights by arrival against schedule.
15 of 66 late departures made up the time and arrived on time, 23% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for DL 1667
The latest arrival of the period was on 2 January 2026, 12 hours 13 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 |
|---|---|---|
| 2 January 2026 | 12 hours 13 minutes | Carrier |
| 29 July 2026 | 2 hours 13 minutes | Late-arriving aircraft |
| 27 December 2025 | 2 hours 2 minutes | Carrier |
| 13 August 2026 | 1 hour 58 minutes | National Airspace System |
| 6 May 2026 | 1 hour 56 minutes | Carrier |
Delay causes
Why DL 1667 runs late
Carrier accounts for 61% of the 3,455 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Carrier
- 26%Late-arriving aircraft
- 12%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 61%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,098 of the 3,455 delay minutes reported here. The split is drawn from 3,455 delay minutes reported on DL 1667.
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
6.6% of arrivals land an hour or more late, close to the national 8.3%, so 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. 272 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 79.7% on time with 0.00% cancelled over 272 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- SLC to DEN, every carrier and departure
- DEN to SLC, the return direction
- Frontier Airlines 3862 on the same route79.6%
- Delta Air Lines 1623 on the same route85.3%
- Delta Air Lines 1586 on the same route68.3%
- Delta Air Lines 1553 on the same route78.9%
- SkyWest Airlines 4720 on the same route90.7%
- SkyWest Airlines 5683 on the same route93.9%
- Salt Lake City International (SLC) delay statistics
- Denver International (DEN) 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.