Flight number record
DL 2663
Delta Air Lines · Denver to Salt Lake City
- Route
- DEN → SLC
- Departs
- 18:23
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2663, check with Delta Air Lines.
DL 2663 sits in the middle of the pack with a C+. About seven flights in ten arrive on time by the DOT's definition, 8 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 365 flights, with a median arrival 1 minute late.
The national on-time rate over the same period is 77.3%, so DL 2663 runs 8 points behind the country as a whole. Across a thousand flights that is about 82 extra late arrivals.
Key figures
On time
69.1%
Arrivals under 15 minutes late, of 363 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
10.7%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2663 flies
DL 2663 flies DEN to SLC without a single fixed slot. Its most common scheduled departure was 18:23, used on 72 of 365 flights, with 18:20 (48 flights) and 18:27 (40 flights) next.
- Departs 18:2372 flights19.7%
- Departs 18:2048 flights13.2%
- Departs 18:2740 flights11.0%
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 18:23 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 2663 runs level with that at 69.1%. 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 2663 next to DEN to SLC
Every carrier on DEN to SLC combined arrived on time 78.2% of the time across 7,713 flights, so DL 2663 is 9 points behind it. Delta flew 1,698 flights on the same city pair under all its flight numbers, including this one, and those ran 82.0% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2663 | 365 | 69.1% | 57 min | 0.00% | C+ |
| All Delta Air Lines on DEN–SLC | 1,698 | 82.0% | 78 min | 0.35% | B+ |
| All carriers on DEN–SLC | 7,713 | 78.2% | 61 min | 0.35% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2663 quarter by quarter
DL 2663 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Jul–Sep 2026 at 55.7%, a swing of 28 points on roughly 73 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 flights71.4%
- Jan–Mar 202690 flights70.0%
- Apr–Jun 202691 flights70.3%
- Jul–Sep 202662 flights55.7%
Scale runs 45% to 90%.
By weekday, DL 2663 did best on Saturday at 78.4% on time and worst on Sunday at 59.6%. Each day rests on about 52 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2663 runs when it is late
The 112 late arrivals split 38 under half an hour, 35 between 30 and 60 minutes, and 39 an hour or more.
- 15+ min early69 flights19.0%
- Within 15 min182 flights50.1%
- 15–29 min late38 flights10.5%
- 30–59 min late35 flights9.6%
- 1–2 hours late26 flights7.2%
- 2+ hours late13 flights3.6%
Scale runs 0% to 100%.
Share of 363 completed flights by arrival against schedule.
18 of 106 late departures made up the time and arrived on time, 17% of them. 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 SLC.
The worst days
Worst days for DL 2663
The latest arrival of the period was on 6 October 2025, 4 hours 30 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 October 2025 | 4 hours 30 minutes | Carrier |
| 30 November 2025 | 3 hours 41 minutes | Late-arriving aircraft |
| 6 March 2026 | 3 hours 15 minutes | Late-arriving aircraft |
| 27 October 2025 | 3 hours 12 minutes | Late-arriving aircraft |
| 1 January 2026 | 2 hours 40 minutes | Carrier |
Delay causes
Why DL 2663 runs late
Late-arriving aircraft accounts for 64% of the 6,431 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Late-arriving aircraft
- 24%Carrier
- 11%National Airspace System
- 1%Extreme weather
64% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,431 reported delay minutes here, that single category outweighs weather by 64 to one. The split is drawn from 6,431 delay minutes reported on DL 2663.
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
10.7% 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 365 flights under DL 2663 in the data flew DEN to SLC. 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. 365 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 2663
For a booking, DL 2663 is one of the weaker ways to fly DEN to SLC: 9 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.
Related
Where to go next
- DEN to SLC, every carrier and departure
- SLC to DEN, the return direction
- United Airlines 1963 on the same route79.9%
- Delta Air Lines 1581 on the same route91.1%
- SkyWest Airlines 5762 on the same route71.3%
- Frontier Airlines 4251 on the same route69.7%
- Delta Air Lines 2544 on the same route88.2%
- Delta Air Lines 1623 on the same route81.4%
- Denver International (DEN) delay statistics
- Salt Lake City International (SLC) 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
- Why the first flight of the morning is statistically safest
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.