Flight number record

DL 2615

Delta Air Lines · Atlanta to Sioux Falls

Route: ATL → FSD
Departs: 21:30
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2615, check with Delta Air Lines.

DL 2615 lands a B+, level with the national rate of 77.6%. Roughly one flight in four arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 3 minutes early.

On time

76.9%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

57 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.81%

1 hour+ late

5.6%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 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.

Schedule

When DL 2615 flies

DL 2615 flies ATL to FSD without a single fixed slot. Its most common scheduled departure was 21:30, used on 115 of 365 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:30115 flights31.5%

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 21:30 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and DL 2615 runs 6 points better at 76.9%. 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 2615 next to ATL to FSD

Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 5 points.

DL 2615 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2615	365	76.9%	57 min	0.82%	B+
All Delta Air Lines on ATL–FSD	365	76.9%	57 min	0.82%	B+
All carriers on ATL–FSD	365	76.9%	57 min	0.82%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2615 quarter by quarter

DL 2615 did not run the same all year. Its best quarter was Apr–Jun 2026 at 82.2% on time and its weakest Jul–Sep 2025 at 67.0%, a swing of 15 points on roughly 91 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 202592 flights67.0%
Oct–Dec 202592 flights81.1%
Jan–Mar 202690 flights77.5%
Apr–Jun 202691 flights82.2%

Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2615 did best on Sunday at 85.4% on time and worst on Tuesday at 71.7%. Each day rests on about 52 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2615 runs late

One category carries most of the weight here. Carrier accounts for 56% of the 4,693 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
56%
National Airspace System
21%
Late-arriving aircraft
16%
Extreme weather
7%

The largest share of delay minutes, 56%, 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 2,632 of the 4,693 delay minutes reported here. The split is drawn from 4,693 delay minutes reported on DL 2615.

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

5.6% 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 954 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 2615 in the data flew ATL to FSD. 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 2615

For a booking, read DL 2615 as 76.9% on time with 0.82% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular 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