Flight number record
DL 2255
Delta Air Lines · Salt Lake City to Detroit
- Route
- SLC → DTW
- Departs
- 18:28
- Flights
- 353
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2255, check with Delta Air Lines.
DL 2255 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 a little over an hour on average. That rests on 353 flights, with a median arrival 12 minutes early.
Key figures
On time
79.0%
Arrivals under 15 minutes late, of 352 completed flights
Avg delay
77 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
11.1%
National rate is 8.3%
These figures cover 353 flights between September 2025 and August 2026. Beyond the headline rate, 11.1% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2255 flies
DL 2255 flies SLC to DTW without a single fixed slot. Its most common scheduled departure was 18:28, used on 79 of 353 flights, with 18:30 (51 flights) and 18:40 (47 flights) next.
- Departs 18:2879 flights22.4%
- Departs 18:3051 flights14.4%
- Departs 18:4047 flights13.3%
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 18:28 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 2255 runs 11 points better at 79.0%. 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 2255 next to SLC to DTW
Every carrier on SLC to DTW combined arrived on time 88.2% of the time across 1,530 flights, so DL 2255 is 9 points behind it. Delta flew 1,528 flights on the same city pair under all its flight numbers, including this one, and those ran 88.2% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2255thin sample | 353 | 79.0% | 77 min | 0.00% | B+ |
| All Delta Air Lines on SLC–DTW | 1,528 | 88.2% | 60 min | 0.13% | A+ |
| All carriers on SLC–DTW | 1,530 | 88.2% | 60 min | 0.13% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2255 quarter by quarter
DL 2255 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jul–Sep 2026 at 53.2%, a swing of 37 points on roughly 71 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 flights90.0%
- Oct–Dec 202591 flights87.9%
- Jan–Mar 202679 flights81.0%
- Apr–Jun 202691 flights82.2%
- Jul–Sep 202662 flights53.2%
Scale runs 45% to 95%.
By weekday, DL 2255 did best on Tuesday at 88.5% on time and worst on Friday at 75.0%. Each day rests on about 50 flights, so a gap of 14 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2255 runs when it is late
DL 2255 often beats the schedule: 154 of 352 completed flights, 44%, arrived 15 minutes or more early. When DL 2255 is late it tends to be very late: 39 of its 74 late arrivals were an hour or more behind, and 16 were two hours or more.
- 15+ min early154 flights43.8%
- Within 15 min124 flights35.2%
- 15–29 min late15 flights4.3%
- 30–59 min late20 flights5.7%
- 1–2 hours late23 flights6.5%
- 2+ hours late16 flights4.5%
Scale runs 0% to 100%.
Share of 352 completed flights by arrival against schedule.
12 of 84 late departures made up the time and arrived on time, 14% of them. Only 2 left on time and still arrived late.
The worst days
Worst days for DL 2255
The latest arrival of the period was on 4 September 2025, 3 hours 28 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. On three of the five worst days the largest share was filed as carrier-caused (crew, maintenance, fuelling, baggage).
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 September 2025 | 3 hours 28 minutes | Late-arriving aircraft |
| 30 March 2026 | 3 hours 20 minutes | Carrier |
| 27 June 2026 | 3 hours 13 minutes | Late-arriving aircraft |
| 11 October 2025 | 3 hours 5 minutes | Carrier |
| 30 November 2025 | 2 hours 57 minutes | Carrier |
Delay causes
Why DL 2255 runs late
Carrier accounts for 63% of the 5,706 delay minutes carriers reported here, and the remaining four split what is left.
- 63%Carrier
- 31%Late-arriving aircraft
- 6%National Airspace System
- 0%Extreme weather
The largest share of delay minutes, 63%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,580 of the 5,706 delay minutes reported here. The split is drawn from 5,706 delay minutes reported on DL 2255.
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
11.1% 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.
The 1,481 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
Every one of the 353 flights under DL 2255 in the data flew SLC to DTW. 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. 353 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 2255
For a booking, DL 2255 is one of the weaker ways to fly SLC to DTW: 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
- SLC to DTW, every carrier and departure
- DTW to SLC, the return direction
- Delta Air Lines 2289 on the same route93.7%
- Delta Air Lines 2236 on the same route93.4%
- Delta Air Lines 2244 on the same route88.4%
- Salt Lake City International (SLC) delay statistics
- Detroit Metropolitan Wayne County (DTW) 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.