Flight number record
DL 1586
Delta Air Lines · Salt Lake City to Denver
- Route
- SLC → DEN
- Departs
- 18:30
- Flights
- 344
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1586, check with Delta Air Lines.
DL 1586 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land a little over an hour behind schedule. That rests on 344 flights, with a median arrival 4 minutes early.
The national on-time rate over the same period is 77.3%, so DL 1586 runs 9 points behind the country as a whole. Across a thousand flights that is about 90 extra late arrivals.
Key figures
On time
68.3%
Arrivals under 15 minutes late, of 344 completed flights
Avg delay
78 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
13.7%
National rate is 8.3%
These figures cover 344 flights between September 2025 and August 2026. Beyond the headline rate, 13.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 1586 flies
DL 1586 flies SLC to DEN without a single fixed slot. Its most common scheduled departure was 18:30, used on 82 of 344 flights, with 17:30 (63 flights) and 18:25 (48 flights) next.
- Departs 18:3082 flights23.8%
- Departs 17:3063 flights18.3%
- Departs 18:2548 flights14.0%
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 18:30 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 1586 runs level with that at 68.3%. 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 1586 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 1586 is 11 points behind 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%, which this flight trails by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1586thin sample | 344 | 68.3% | 78 min | 0.00% | C+ |
| 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 1586 quarter by quarter
DL 1586 did not run the same all year. Its best quarter was Apr–Jun 2026 at 78.2% on time and its weakest Jul–Sep 2026 at 39.3%, a swing of 39 points on roughly 86 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 202526 flights—
- Oct–Dec 202581 flights74.1%
- Jan–Mar 202689 flights71.9%
- Apr–Jun 202687 flights78.2%
- Jul–Sep 202661 flights39.3%
Scale runs 30% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, DL 1586 did best on Tuesday at 78.3% on time and worst on Monday at 57.7%. Each day rests on about 49 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1586 runs when it is late
The 109 late arrivals split 32 under half an hour, 30 between 30 and 60 minutes, and 47 an hour or more.
- 15+ min early77 flights22.4%
- Within 15 min158 flights45.9%
- 15–29 min late32 flights9.3%
- 30–59 min late30 flights8.7%
- 1–2 hours late26 flights7.6%
- 2+ hours late21 flights6.1%
Scale runs 0% to 100%.
Share of 344 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 91 departures that left 15 minutes late or more, only 6 made it up before arrival. In the other direction, 24 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 DEN.
The worst days
Worst days for DL 1586
The latest arrival of the period was on 2 July 2026, 12 hours 53 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 July 2026 | 12 hours 53 minutes | Carrier |
| 18 February 2026 | 5 hours 37 minutes | Carrier |
| 29 July 2026 | 4 hours 26 minutes | Late-arriving aircraft |
| 24 June 2026 | 3 hours 29 minutes | Late-arriving aircraft |
| 29 December 2025 | 3 hours 20 minutes | Carrier |
Delay causes
Why DL 1586 runs late
Carrier accounts for 44% of the 8,519 delay minutes carriers reported here, and the remaining four split what is left.
- 44%Carrier
- 30%Late-arriving aircraft
- 24%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,727 of the 8,519 delay minutes reported here. The split is drawn from 8,519 delay minutes reported on DL 1586.
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
13.7% 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.
Every one of the 344 flights under DL 1586 in the data flew SLC to DEN. 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. 344 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 1586
For a booking, DL 1586 is a flight to put a long connection behind. 13.7% of its completed flights arrived an hour or more late, which a short layover will not absorb. If the onward flight is on a separate ticket, the risk sits with you.
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 1553 on the same route78.9%
- SkyWest Airlines 4720 on the same route90.7%
- Delta Air Lines 1667 on the same route79.7%
- 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
- 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.