Flight number record

DL 2544

Delta Air Lines · Denver to Salt Lake City

Route: DEN → SLC
Departs: 05:30
Flights: 262
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2544, check with Delta Air Lines.

DL 2544 earns an A+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 9 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 262 flights, with a median arrival 11 minutes early.

Set against the rest of the country, DL 2544's record is 9 points better than the US average of 77.6%. That gap is worth roughly 93 fewer late arrivals for every thousand flights.

On time

86.9%

Arrivals under 15 minutes late, of 260 completed flights

Avg delay

112 min

Across delayed arrivals only, not all flights

Cancelled

0.38%

National rate is 1.81%

1 hour+ late

4.2%

National rate is 8.1%

These figures cover 262 flights between July 2025 and June 2026. The median arrival is 11 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.

Schedule

When DL 2544 flies

DL 2544 flies DEN to SLC without a single fixed slot. Its most common scheduled departure was 05:30, used on 160 of 262 flights, with 05:45 (38 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 05:30160 flights61.1%
Departs 05:4538 flights14.5%

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 05:30 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2544 runs 2 points worse at 86.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 2544 next to DEN to SLC

Every carrier on DEN to SLC combined arrived on time 77.5% of the time across 7,758 flights, so DL 2544 is 9 points ahead of it. Delta flew 1,689 flights on the same city pair under all its flight numbers, including this one, and those ran 82.3% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 5 points.

DL 2544 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2544thin sample	262	86.9%	112 min	0.38%	A+
All Delta Air Lines on DEN–SLC	1,689	82.3%	81 min	0.41%	B+
All carriers on DEN–SLC	7,758	77.5%	61 min	0.48%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2544 quarter by quarter

Quarter by quarter DL 2544 held fairly steady: 82.5% in Jul–Sep 2025, 91.7% in Oct–Dec 2025, 88.2% in Jan–Mar 2026 and 86.0% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202564 flights82.5%
Oct–Dec 202561 flights91.7%
Jan–Mar 202651 flights88.2%
Apr–Jun 202686 flights86.0%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2544 did best on Wednesday at 100.0% on time and worst on Saturday at 78.3%. Each day rests on about 37 flights, so a gap of 22 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2544 runs late

One category carries most of the weight here. Carrier accounts for 66% of the 3,791 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
66%
Late-arriving aircraft
19%
Extreme weather
8%
National Airspace System
7%

The largest share of delay minutes, 66%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,506 of the 3,791 delay minutes reported here. The split is drawn from 3,791 delay minutes reported on DL 2544.

Cancellations are rare at 0.38%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 4.2% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

Every one of the 262 flights under DL 2544 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. 262 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 2544

For a booking, DL 2544 has one of the better records a US domestic flight can show: 86.9% on time and 0.38% cancelled. That is a base rate, not a promise about any single day.

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