Carrier route record

DLSFO→ATL

Delta Air Lines · San Francisco to Atlanta

Flights: 2,407
Period: July 2025 to June 2026
Share of route: 72%
Carriers: 3

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

Delta on SFO to ATL 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 2,407 flights, with a median arrival 8 minutes early.

Set against the rest of the country, Delta's SFO to ATL 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 2,385 completed flights

Avg delay

68 min

Across delayed arrivals only, not all flights

Cancelled

0.66%

National rate is 1.81%

Whole route

81.6%

Every carrier on SFO to ATL, 3,350 flights

These figures cover 2,407 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.

Carrier by carrier

Delta against every carrier on SFO to ATL

Delta flew 2,407 of the 3,350 flights on SFO to ATL, most of the route. Its 83.0% on time is about level with the route as a whole at 81.6%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from United at 86.5% to Frontier at 59.7%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.

Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.

On-time performance by carrier on SFO to ATL
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	637	86.5%	54 min	0.16%	A+
Delta Air Lines (this page)	2,407	83.0%	68 min	0.66%	B+
Frontier Airlinesthin sample	306	59.7%	72 min	3.27%	D−

Flight by flight

Delta flight numbers on SFO to ATL

Departure window

When Delta runs best on this route

Departure time matters more here than the choice of carrier. The gap between the best and worst window is 17 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am539 flights92.3%
8am–11am269 flights88.4%
11am–2pm565 flights82.4%
2pm–5pm300 flights80.7%
5pm–8pm—
8pm–5am734 flights75.7%

Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 92.3% of the time, against 75.7% for the overnight window. That is 17 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8pm–5am window is the busiest, with 734 flights scheduled in it.

Across the year

Delta on SFO to ATL through the year

Darker means more delays. Figures are on-time percentages.February best, May worst

Delays peak in May, when the on-time rate falls to 71.9%. February is the strongest month at 90.9%. Moving a flexible trip across that boundary buys 19 points. July was the busiest month here, with 227 flights.

Across the week, Tuesday is the strongest day at 87.8% on time and Thursday the weakest at 79.2%. 9 points is a smaller lever than departure hour, but it is free.

Delay causes

Why Delta runs late on this route

One category carries most of the weight here. Carrier accounts for 46% of the 28,000 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
46%
Late-arriving aircraft
42%
National Airspace System
11%
Extreme weather
1%

42% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 28,000 reported delay minutes here, that single category outweighs weather by 31 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 27,599 reported delay minutes.

The largest share of delay minutes, 46%, 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 13,000 of the 28,000 delay minutes reported here.

Cancellations are rare at 0.66%, 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 stage length

What a delay here costs

5.5% 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 a little over an hour, which a normal layover absorbs.

At 2,139 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.

The return leg is a different operation and performs like one: it runs 70.2% on time across 2,410 flights, 13 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 13 points of difference.

The sample behind these figures is 2,407 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.

What to do with this

Booking Delta on SFO to ATL

Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 90.9% on time and May 71.9%, a swing of 19 points. If the dates move at all, move them out of May before you think about anything else. 2,385 completed flights over 12 months sit behind that.

Where to go next

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