Flight number record

DL 2040

Delta Air Lines · Salt Lake City to Miami

Route: SLC → MIA
Departs: 23:55
Flights: 364
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2040, check with Delta Air Lines.

DL 2040 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 about an hour. That rests on 364 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 2040's record is 11 points better than the US average of 77.3%. That gap is worth roughly 108 fewer late arrivals for every thousand flights.

On time

88.1%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

58 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.89%

1 hour+ late

2.5%

National rate is 8.3%

These figures cover 364 flights between September 2025 and August 2026. The median arrival is 8 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 2040 flies

DL 2040 flies SLC to MIA without a single fixed slot. Its most common scheduled departure was 23:55, used on 58 of 364 flights, with 23:00 (58 flights) and 22:50 (46 flights) next.

Departs 23:5558 flights15.9%
Departs 23:0058 flights15.9%
Departs 22:5046 flights12.6%

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 23:55 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 2040 runs 18 points better at 88.1%. 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 2040 next to SLC to MIA

Every carrier on SLC to MIA combined arrived on time 84.2% of the time across 818 flights, so DL 2040 is 4 points ahead of it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 7 points.

DL 2040 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2040thin sample	364	88.1%	58 min	0.55%	A+
All Delta Air Lines on SLC–MIAthin sample	364	88.1%	58 min	0.55%	A+
All carriers on SLC–MIA	818	84.2%	75 min	0.61%	B+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 2040 quarter by quarter

DL 2040 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 82.3%, a swing of 11 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 flights93.3%
Oct–Dec 202591 flights83.5%
Jan–Mar 202690 flights92.0%
Apr–Jun 202691 flights91.2%
Jul–Sep 202662 flights82.3%

Scale runs 75% to 100%.

By weekday, DL 2040 did best on Wednesday at 96.2% on time and worst on Friday at 80.4%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Arrival by arrival

How late DL 2040 runs when it is late

Most of the lateness is short. 23 of the 43 late arrivals were under half an hour behind, and 9 reached an hour or more.

15+ min early86 flights23.8%
Within 15 min233 flights64.4%
15–29 min late23 flights6.4%
30–59 min late11 flights3.0%
1–2 hours late5 flights1.4%
2+ hours late4 flights1.1%

Scale runs 0% to 100%.

Share of 362 completed flights by arrival against schedule.

11 of 46 late departures made up the time and arrived on time, 24% of them. 8 flights left on time and still arrived late.

The worst days

Worst days for DL 2040

The latest arrival of the period was on 6 June 2026, 11 hours 21 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 2040 in the period
Date	Arrived late by	Largest filed cause
6 June 2026	11 hours 21 minutes	Carrier
30 October 2025	3 hours 11 minutes	Late-arriving aircraft
26 December 2025	2 hours 39 minutes	Carrier
2 August 2026	2 hours 31 minutes	Carrier
17 August 2026	1 hour 29 minutes	Late-arriving aircraft

Delay causes

Why DL 2040 runs late

Carrier accounts for 67% of the 2,498 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
67%
Late-arriving aircraft
23%
National Airspace System
10%
Extreme weather
0%

The largest share of delay minutes, 67%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,668 of the 2,498 delay minutes reported here. The split is drawn from 2,498 delay minutes reported on DL 2040.

Cancellations are rare at 0.55%, 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 2.5% 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.

At 2,088 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.

Every one of the 364 flights under DL 2040 in the data flew SLC to MIA. 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. 364 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 2040

For a booking, DL 2040 has one of the better records a US domestic flight can show: 88.1% on time and 0.55% 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