Flight number record

DL 2515

Delta Air Lines · Salt Lake City to Memphis

Route: SLC → MEM
Departs: 13:55
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2515, check with Delta Air Lines.

DL 2515 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 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 365 flights, with a median arrival 8 minutes early.

Set against the rest of the country, DL 2515's record is 8 points better than the US average of 77.6%. That gap is worth roughly 80 fewer late arrivals for every thousand flights.

On time

85.6%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

67 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.81%

1 hour+ late

6.1%

National rate is 8.1%

These figures cover 365 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 2515 flies

DL 2515 flies SLC to MEM without a single fixed slot. Its most common scheduled departure was 13:55, used on 127 of 365 flights, with 13:50 (119 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 13:55127 flights34.8%
Departs 13:50119 flights32.6%

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 13:55 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and DL 2515 runs 7 points better at 85.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

DL 2515 next to SLC to MEM

Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 4 points.

DL 2515 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2515	365	85.6%	67 min	0.82%	A+
All Delta Air Lines on SLC–MEM	365	85.6%	67 min	0.82%	A+
All carriers on SLC–MEM	365	85.6%	67 min	0.82%	A+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2515 quarter by quarter

Quarter by quarter DL 2515 held fairly steady: 88.0% in Jul–Sep 2025, 87.0% in Oct–Dec 2025, 81.6% in Jan–Mar 2026 and 85.7% in Apr–Jun 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 202592 flights88.0%
Oct–Dec 202592 flights87.0%
Jan–Mar 202690 flights81.6%
Apr–Jun 202691 flights85.7%

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

By weekday, DL 2515 ranged from 82.4% on Friday to 92.2% on Saturday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 2515 runs late

One category carries most of the weight here. Carrier accounts for 79% of the 3,498 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
79%
Late-arriving aircraft
14%
National Airspace System
7%

The largest share of delay minutes, 79%, 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 2,761 of the 3,498 delay minutes reported here. The split is drawn from 3,498 delay minutes reported on DL 2515.

Cancellations are rare at 0.82%, 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

6.1% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

The 1,262 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 365 flights under DL 2515 in the data flew SLC to MEM. 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. 365 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 2515

For a booking, DL 2515 has one of the better records a US domestic flight can show: 85.6% on time and 0.82% 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