Route reliability record
SJC→ATL
San Jose to Atlanta
- Flights
- 900
- Period
- July 2025 to June 2026
- Distance
- 2,116 mi
- Carriers
- 1
This route earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 16 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 900 SJC to ATL flights, with a median arrival 17 minutes early.
Best time to fly SJC to ATL: a 5am–8am departure, ideally on a Monday. Flights in that window arrived on time 94.1% of the time and Monday flights 96.2%, against 93.1% for the route overall.
Set against the rest of the country, this route's record is 16 points better than the US average of 77.6%. That gap is worth roughly 155 fewer late arrivals for every thousand flights.
Key figures
On time
93.1%
Arrivals under 15 minutes late, of 887 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
1.33%
National rate is 1.81%
Best carrier
Delta
93.1% on time across 900 flights
These figures cover 900 flights between July 2025 and June 2026. The median arrival is 17 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
Which airline is most reliable on SJC to ATL
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.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 900 | 93.1% | 69 min | 1.33% | A |
Flight by flight
Flights on SJC to ATL
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Best ways to make this trip
The most reliable ways to fly San Jose to Atlanta
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 2 of the top 3 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. SJC → ATLSan Jose to Atlanta | Delta Air Lines | 91.9% | 93.1% | 1.33% | 5am–8am, Mon | DL 654 06:35 |
| 2. SFO → ATLSan Francisco to Atlanta | United Airlines | 86.4% | 86.5% | 0.16% | 8am–11am, Mon | — |
| 3. SFO → ATLSan Francisco to Atlanta | Delta Air Lines | 82.5% | 83.0% | 0.66% | 5am–8am, Tue | DL 570 06:00 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 900 flights.
- 5am–8am243 flights94.1%
- 8am–11am—
- 11am–2pm302 flights92.6%
- 2pm–5pm62 flights93.5%
- 5pm–8pm—
- 8pm–5am293 flights92.7%
Scale runs 85% to 100%. Rows with fewer than 30 flights show a dash.
The overnight block holds up unusually well at 92.7% on time across 293 flights. Red-eyes fly into empty airspace and empty gates, and they are the first rotation of the aircraft's day rather than the last. The 11am–2pm window is the busiest, with 302 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 15 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
April is the best month on the calendar at 100.0% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. July was the busiest month here, with 88 flights.
Across the week, Monday is the strongest day at 96.2% on time and Sunday the weakest at 89.3%. 7 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
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 4,207 reported delay minutes.
- 40%Carrier
- 32%Late-arriving aircraft
- 22%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 40%, 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 1,694 of the 4,207 delay minutes reported here. The split is drawn from 4,207 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 94.1% on time here.
Cancellations sit at 1.33% against a national 1.81%, which is ordinary. Diversions add another 0.11%.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 1.8% 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 2,116 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 86.9% on time across 900 flights, 6 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 6 points of difference.
One caution: this is a thin sample. 900 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.
Work out the risk of missing a connection in ATL after this flight
What to do with this
Booking this route
Put together: treat all of this as provisional. 900 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 93.1% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 887 completed flights over 12 months sit behind that.
Common questions
SJC to ATL questions
How often is SJC to ATL delayed?
About one flight in fifteen arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 6.9% of the 900 flights in this analysis, against 22.4% nationally. Delayed flights are late by a little over an hour on average.
How reliable is SJC to ATL compared with the rest of the country?
93.1% of flights arrive on time here against a national 77.6%, a difference of 16 points in its favour. That is worth a A on this site's grading scale.
What time of day has the fewest delays on SJC to ATL?
The 5am–8am departure window is the strongest at 94.1% on time. The 11am–2pm window is the weakest at 92.6%, 2 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are March delays on SJC to ATL?
March is the weakest month at 85.2% on time, compared with 100.0% in April. Across the year that is 15 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- ATL to SJC — the return legseparate record
- Norman Y. Mineta San Jose International (SJC) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- SJC to SAN, a related route72.4%
- LGA to ATL, a related route76.6%
- SJC to LAX, a related route86.6%
- Delta Air Lines on-time record93.1%
- Why the first flight of the morning is statistically safest
- Worst months to fly in the US, ranked by the data
Direction matters. SJC to ATL and ATL to SJC are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.