Flight number record

DL 2544

Delta Air Lines · Denver to Salt Lake City

Route: DEN → SLC
Departs: 05:30
Flights: 274
Period: September 2025 to August 2026

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

DL 2544 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 274 flights, with a median arrival 12 minutes early.

Set against the rest of the country, DL 2544's record is 11 points better than the US average of 77.3%. That gap is worth roughly 109 fewer late arrivals for every thousand flights.

On time

88.2%

Arrivals under 15 minutes late, of 272 completed flights

Avg delay

118 min

Across delayed arrivals only, not all flights

Cancelled

0.36%

National rate is 1.89%

1 hour+ late

4.4%

National rate is 8.3%

These figures cover 274 flights between September 2025 and August 2026. The median arrival is 12 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.

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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 130 of 274 flights, with 05:40 (53 flights) next.

Departs 05:30130 flights47.4%
Departs 05:4053 flights19.3%

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 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 level with that at 88.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

DL 2544 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 2544 is 10 points ahead of 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 beats by 7 points.

DL 2544 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2544thin sample	274	88.2%	118 min	0.36%	A+
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 2544 quarter by quarter

Quarter by quarter DL 2544 held fairly steady: 91.7% in Oct–Dec 2025, 88.2% in Jan–Mar 2026, 86.0% in Apr–Jun 2026 and 87.7% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202518 flights—
Oct–Dec 202561 flights91.7%
Jan–Mar 202651 flights88.2%
Apr–Jun 202686 flights86.0%
Jul–Sep 202658 flights87.7%

Scale runs 80% 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 78.7%. Each day rests on about 39 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 2544 runs when it is late

DL 2544 often beats the schedule: 113 of 272 completed flights, 42%, arrived 15 minutes or more early. The 32 late arrivals split 11 under half an hour, 9 between 30 and 60 minutes, and 12 an hour or more.

15+ min early113 flights41.5%
Within 15 min127 flights46.7%
15–29 min late11 flights4.0%
30–59 min late9 flights3.3%
1–2 hours late4 flights1.5%
2+ hours late8 flights2.9%

Scale runs 0% to 100%.

Share of 272 completed flights by arrival against schedule.

Time lost at the gate mostly stays lost. Of 24 departures that left 15 minutes late or more, only 2 made it up before arrival. 10 flights left on time and still arrived late.

The worst days

Worst days for DL 2544

The latest arrival of the period was on 29 September 2025, 11 hours 19 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.

The latest arrivals of DL 2544 in the period
Date	Arrived late by	Largest filed cause
29 September 2025	11 hours 19 minutes	Carrier
21 August 2026	8 hours 9 minutes	Carrier
3 January 2026	6 hours 28 minutes	Late-arriving aircraft
13 April 2026	5 hours 2 minutes	Extreme weather
31 January 2026	4 hours 49 minutes	Carrier

Delay causes

Why DL 2544 runs late

Carrier accounts for 69% of the 3,786 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
69%
Late-arriving aircraft
16%
Extreme weather
8%
National Airspace System
7%

The largest share of delay minutes, 69%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,605 of the 3,786 delay minutes reported here. The split is drawn from 3,786 delay minutes reported on DL 2544.

Cancellations are rare at 0.36%, below the national 1.89% 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 4.4% land an hour or more behind schedule, against 8.3% 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 274 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. 274 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: 88.2% on time and 0.36% 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures