Flight number record

DL 2040

Delta Air Lines · Salt Lake City to Miami

Route: SLC → MIA
Departs: 23:50
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. 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 77.6%. That gap is worth roughly 105 fewer late arrivals for every thousand flights.

On time

88.1%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

0.55%

National rate is 1.81%

1 hour+ late

2.5%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 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.

Schedule

When DL 2040 flies

DL 2040 flies SLC to MIA without a single fixed slot. Its most common scheduled departure was 23:50, used on 72 of 364 flights, with 23:55 (58 flights) and 22:50 (46 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 23:5072 flights19.8%
Departs 23:5558 flights15.9%
Departs 22:5046 flights12.6%

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 23:50 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, 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.

Against the route

DL 2040 next to SLC to MIA

Every carrier on SLC to MIA combined arrived on time 84.5% of the time across 776 flights, so DL 2040 is 4 points ahead of it. Across its whole network Delta Air Lines managed 81.6%, 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%	57 min	0.55%	A+
All Delta Air Lines on SLC–MIAthin sample	364	88.1%	57 min	0.55%	A+
All carriers on SLC–MIA	776	84.5%	62 min	0.90%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2040 quarter by quarter

Quarter by quarter DL 2040 held fairly steady: 85.9% in Jul–Sep 2025, 83.5% in Oct–Dec 2025, 92.0% in Jan–Mar 2026 and 91.2% 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 202592 flights85.9%
Oct–Dec 202591 flights83.5%
Jan–Mar 202690 flights92.0%
Apr–Jun 202691 flights91.2%

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

By weekday, DL 2040 did best on Sunday at 96.1% on time and worst on Thursday at 78.8%. Each day rests on about 52 flights, so a gap of 17 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2040 runs late

One category carries most of the weight here. Carrier accounts for 67% of the 2,432 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
67%
Late-arriving aircraft
20%
National Airspace System
13%

The largest share of delay minutes, 67%, 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 1,624 of the 2,432 delay minutes reported here. The split is drawn from 2,432 delay minutes reported on DL 2040.

Cancellations are rare at 0.55%, 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 2.5% 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.

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures