Flight number record

DL 2255

Delta Air Lines · Salt Lake City to Detroit

Route: SLC → DTW
Departs: 18:33
Flights: 353
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2255, check with Delta Air Lines.

DL 2255 lands a B+, 4 points better than the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 353 flights, with a median arrival 14 minutes early.

Set against the rest of the country, DL 2255's record is 4 points better than the US average of 77.6%. That gap is worth roughly 42 fewer late arrivals for every thousand flights.

On time

81.8%

Arrivals under 15 minutes late, of 352 completed flights

Avg delay

78 min

Across delayed arrivals only, not all flights

Cancelled

0.00%

National rate is 1.81%

1 hour+ late

9.1%

National rate is 8.1%

These figures cover 353 flights between July 2025 and June 2026. Beyond the headline rate, 9.1% 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 2255 flies

DL 2255 flies SLC to DTW without a single fixed slot. Its most common scheduled departure was 18:33, used on 60 of 353 flights, with 18:30 (51 flights) and 18:40 (42 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:3360 flights17.0%
Departs 18:3051 flights14.4%
Departs 18:4042 flights11.9%

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 18:33 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 2255 runs 14 points better at 81.8%. 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 2255 next to SLC to DTW

Every carrier on SLC to DTW combined arrived on time 89.5% of the time across 1,567 flights, so DL 2255 is 8 points behind it. Delta flew 1,539 flights on the same city pair under all its flight numbers, including this one, and those ran 89.4% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 2255 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2255thin sample	353	81.8%	78 min	0.00%	B+
All Delta Air Lines on SLC–DTW	1,539	89.4%	61 min	0.19%	A+
All carriers on SLC–DTW	1,567	89.5%	64 min	0.19%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2255 quarter by quarter

DL 2255 did not run the same all year. Its best quarter was Oct–Dec 2025 at 87.9% on time and its weakest Jul–Sep 2025 at 76.1%, a swing of 12 points on roughly 88 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 202592 flights76.1%
Oct–Dec 202591 flights87.9%
Jan–Mar 202679 flights81.0%
Apr–Jun 202691 flights82.2%

Scale runs 70% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2255 ranged from 78.6% on Saturday to 86.5% on Wednesday. With about 50 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 2255 runs late

One category carries most of the weight here. Carrier accounts for 59% of the 4,975 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
36%
National Airspace System
5%
Extreme weather
0%

36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,975 reported delay minutes here, that single category outweighs weather by 36 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,975 delay minutes reported on DL 2255.

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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 9.1% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

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: 8 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.

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