Flight number record

DL 515

Delta Air Lines · Los Angeles to Atlanta

Route: LAX → ATL
Departs: 07:15
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 515, check with Delta Air Lines.

DL 515 lands a B, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 4 minutes early.

Set against the rest of the country, DL 515's record is 5 points better than the US average of 77.6%. That gap is worth roughly 54 fewer late arrivals for every thousand flights.

On time

83.0%

Arrivals under 15 minutes late, of 359 completed flights

Avg delay

81 min

Across delayed arrivals only, not all flights

Cancelled

1.37%

National rate is 1.81%

1 hour+ late

3.6%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 4 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 515 flies

DL 515 flies LAX to ATL without a single fixed slot. Its most common scheduled departure was 07:15, used on 149 of 365 flights, with 07:00 (73 flights) and 08:25 (52 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:15149 flights40.8%
Departs 07:0073 flights20.0%
Departs 08:2552 flights14.2%

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 07:15 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 515 runs 6 points worse at 83.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 515 next to LAX to ATL

Every carrier on LAX to ATL combined arrived on time 78.4% of the time across 5,013 flights, so DL 515 is 5 points ahead of it. Delta flew 3,844 flights on the same city pair under all its flight numbers, including this one, and those ran 81.5% on time. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 515 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 515	365	83.0%	81 min	1.37%	B
All Delta Air Lines on LAX–ATL	3,844	81.5%	64 min	0.86%	B+
All carriers on LAX–ATL	5,013	78.4%	67 min	0.92%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 515 quarter by quarter

DL 515 did not run the same all year. Its best quarter was Jul–Sep 2025 at 92.3% on time and its weakest Jan–Mar 2026 at 65.9%, a swing of 26 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 flights92.3%
Oct–Dec 202592 flights87.6%
Jan–Mar 202690 flights65.9%
Apr–Jun 202691 flights85.7%

Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, DL 515 did best on Wednesday at 90.2% on time and worst on Saturday at 72.5%. Each day rests on about 52 flights, so a gap of 18 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 515 runs late

One category carries most of the weight here. Carrier accounts for 72% of the 4,937 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
72%
National Airspace System
15%
Late-arriving aircraft
11%
Security
1%
Extreme weather
0%

The largest share of delay minutes, 72%, 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 3,538 of the 4,937 delay minutes reported here. The split is drawn from 4,937 delay minutes reported on DL 515.

Cancellations sit at 1.37% against a national 1.81%, which is ordinary. Diversions add another 0.27%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 3.6% 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 1,947 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 365 flights under DL 515 in the data flew LAX to ATL. 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 515

For a booking, read DL 515 as 83.0% on time with 1.37% 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