Flight number record
DL 2515
Delta Air Lines · Salt Lake City to Memphis
- Route
- SLC → MEM
- Departs
- 13:50
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2515, check with Delta Air Lines.
DL 2515 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. 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 7 points better than the US average of 77.3%. That gap is worth roughly 69 fewer late arrivals for every thousand flights.
Key figures
On time
84.2%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.89%
1 hour+ late
5.3%
National rate is 8.3%
These figures cover 365 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 2515 flies
DL 2515 flies SLC to MEM without a single fixed slot. Its most common scheduled departure was 13:50, used on 119 of 365 flights, with 13:40 (86 flights) and 13:55 (65 flights) next.
- Departs 13:50119 flights32.6%
- Departs 13:4086 flights23.6%
- Departs 13:5565 flights17.8%
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 13:50 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and DL 2515 runs 6 points better at 84.2%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 2515 next to SLC to MEM
Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2515 | 365 | 84.2% | 60 min | 0.82% | B+ |
| All Delta Air Lines on SLC–MEM | 365 | 84.2% | 60 min | 0.82% | B+ |
| All carriers on SLC–MEM | 365 | 84.2% | 60 min | 0.82% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2515 quarter by quarter
Quarter by quarter DL 2515 held fairly steady: 83.3% in Jul–Sep 2025, 87.0% in Oct–Dec 2025, 81.6% in Jan–Mar 2026, 85.7% in Apr–Jun 2026 and 81.7% in Jul–Sep 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights83.3%
- Oct–Dec 202592 flights87.0%
- Jan–Mar 202690 flights81.6%
- Apr–Jun 202691 flights85.7%
- Jul–Sep 202662 flights81.7%
Scale runs 75% to 90%.
By weekday, DL 2515 ranged from 80.8% on Sunday to 89.8% on Saturday. With about 52 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 2515 runs when it is late
DL 2515 often beats the schedule: 92 of 360 completed flights, 26%, arrived 15 minutes or more early. The 57 late arrivals split 21 under half an hour, 17 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early92 flights25.6%
- Within 15 min211 flights58.6%
- 15–29 min late21 flights5.8%
- 30–59 min late17 flights4.7%
- 1–2 hours late13 flights3.6%
- 2+ hours late6 flights1.7%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
13 of 58 late departures made up the time and arrived on time, 22% of them. 12 flights left on time and still arrived late.
The worst days
Worst days for DL 2515
The latest arrival of the period was on 17 March 2026, 6 hours 16 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 March 2026 | 6 hours 16 minutes | Carrier |
| 15 January 2026 | 4 hours | Carrier |
| 7 August 2026 | 2 hours 57 minutes | Carrier |
| 9 November 2025 | 2 hours 15 minutes | Carrier |
| 19 May 2026 | 2 hours 6 minutes | Carrier |
Delay causes
Why DL 2515 runs late
Carrier accounts for 75% of the 3,410 delay minutes carriers reported here, and the remaining four split what is left.
- 75%Carrier
- 14%Late-arriving aircraft
- 9%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 75%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,563 of the 3,410 delay minutes reported here. The split is drawn from 3,410 delay minutes reported on DL 2515.
Cancellations are rare at 0.82%, 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
5.3% of arrivals land an hour or more late, close to the national 8.3%, so 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.
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, read DL 2515 as 84.2% on time with 0.82% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Salt Lake City International (SLC) delay statistics
- Memphis International (MEM) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.