Flight number record
DL 3115
Delta Air Lines · Atlanta to Sarasota
- Route
- ATL → SRQ
- Departs
- 17:15
- Flights
- 322
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 3115, check with Delta Air Lines.
DL 3115 lands a B, level with the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by roughly 55 minutes on average. That rests on 322 flights, with a median arrival 3 minutes early.
Key figures
On time
78.0%
Arrivals under 15 minutes late, of 318 completed flights
Avg delay
54 min
Across delayed arrivals only, not all flights
Cancelled
1.24%
National rate is 1.89%
1 hour+ late
6.3%
National rate is 8.3%
These figures cover 322 flights between September 2025 and August 2026. The median arrival is 3 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 3115 flies
DL 3115 flies ATL to SRQ without a single fixed slot. Its most common scheduled departure was 17:15, used on 43 of 322 flights, with 14:46 (40 flights) next.
- Departs 17:1543 flights13.4%
- Departs 14:4640 flights12.4%
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 17:15 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 3115 runs 10 points better at 78.0%. 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 3115 next to ATL to SRQ
Every carrier on ATL to SRQ combined arrived on time 80.8% of the time across 2,289 flights, so DL 3115 is 3 points behind it. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 3115thin sample | 322 | 78.0% | 54 min | 1.24% | B |
| All Delta Air Lines on ATL–SRQ | 2,289 | 80.8% | 57 min | 1.66% | B |
| All carriers on ATL–SRQ | 2,289 | 80.8% | 57 min | 1.66% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 3115 quarter by quarter
DL 3115 did not run the same all year. Its best quarter was Oct–Dec 2025 at 85.4% on time and its weakest Jul–Sep 2026 at 50.0%, a swing of 35 points on roughly 81 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 202512 flights—
- Oct–Dec 202590 flights85.4%
- Jan–Mar 202690 flights80.5%
- Apr–Jun 202688 flights84.1%
- Jul–Sep 202642 flights50.0%
Scale runs 40% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, DL 3115 did best on Wednesday at 85.1% on time and worst on Sunday at 69.6%. Each day rests on about 46 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 3115 runs when it is late
The 70 late arrivals split 25 under half an hour, 25 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early20 flights6.3%
- Within 15 min228 flights71.7%
- 15–29 min late25 flights7.9%
- 30–59 min late25 flights7.9%
- 1–2 hours late14 flights4.4%
- 2+ hours late6 flights1.9%
Scale runs 0% to 100%.
Share of 318 completed flights by arrival against schedule.
8 of 60 late departures made up the time and arrived on time, 13% of them. In the other direction, 18 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SRQ.
The worst days
Worst days for DL 3115
The latest arrival of the period was on 7 March 2026, 4 hours 34 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 March 2026 | 4 hours 34 minutes | Carrier |
| 19 July 2026 | 3 hours 55 minutes | Late-arriving aircraft |
| 12 July 2026 | 2 hours 20 minutes | Late-arriving aircraft |
| 20 October 2025 | 2 hours 18 minutes | Carrier |
| 7 December 2025 | 2 hours 16 minutes | Late-arriving aircraft |
Delay causes
Why DL 3115 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,759 reported delay minutes.
- 41%Carrier
- 30%Late-arriving aircraft
- 24%National Airspace System
- 3%Extreme weather
- 2%Security
The largest share of delay minutes, 41%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,537 of the 3,759 delay minutes reported here. The split is drawn from 3,759 delay minutes reported on DL 3115.
Cancellations sit at 1.24% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
6.3% 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 roughly 55 minutes, which a normal layover absorbs.
DL 3115 is not only a ATL to SRQ flight. It also flew SRQ to ATL (259 flights, 79.5% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
One caution: this is a thin sample. 322 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SRQ to ATLthin sample | 259 | 79.5% | 57 min | 1.54% | B |
What to do with this
Booking DL 3115
For a booking, read DL 3115 as 78.0% on time with 1.24% cancelled over 322 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ATL to SRQ, every carrier and departure
- SRQ to ATL, the return direction
- Delta Air Lines 3104 on the same route85.0%
- Delta Air Lines 2997 on the same route78.4%
- Delta Air Lines 1057 on the same route70.4%
- Delta Air Lines 2438 on the same route86.5%
- Delta Air Lines 3196 on the same route94.2%
- Hartsfield-Jackson Atlanta International (ATL) 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.