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Route on-time record

ATL to SAT: most on-time flights and the best time to fly

Atlanta (Hartsfield Jackson Atlanta International Airport) to San Antonio (San Antonio International Airport). 3,079 nonstop flights in Jun 2025 to May 2026, 79% arrived within 15 minutes and 1.5% were cancelled. The most reliable flight number was Delta 1676 at 8:15 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

ATL → SAT

Atlanta to San Antonio: 3,079 nonstop flights a year

On time (12 months)

79%

Cancelled

1.5%

avg delay 13 min

Best time to leave

Before 9 AM

88% on time vs 70% 6 to 9 PM

Most reliable airline

Southwest

82% chance on time

Check ATL to SAT fares

Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

  1. #1 · Delta 1676

    8:15 AM → 9:55 AM2h 36m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    88%

    chance on time

    On time (history)
    93%
    Cancelled
    5.3%
    Avg arrival delay
    3 min
    • Arrived on time 93% of the time (161 flights, Jun 2025 to May 2026).
    • Cancelled 5.3% of the time (9 of 170).
    • Leaves in this route's most on-time window (Before 9 AM: 88% on time; 6 to 9 PM: 70%).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Moderate track record · 161 flights

    Find Delta 1676 fares Opens this date on Aviasales

  2. #2 · Delta 1121

    9:40 AM → 11:13 AM2h 36m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    83%

    chance on time

    On time (history)
    85%
    Cancelled
    1.4%
    Avg arrival delay
    8 min
    • Arrived on time 85% of the time (73 flights, Jun 2025 to May 2026).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Moderate track record · 73 flights

    Find Delta 1121 fares Opens this date on Aviasales

  3. #3 · Delta 1408

    11:03 AM → 12:42 PM2h 34m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    81%

    chance on time

    On time (history)
    82%
    Cancelled
    1.9%
    Avg arrival delay
    14 min
    • Arrived on time 82% of the time (353 flights, Jun 2025 to May 2026).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Strong track record · 353 flights

    Find Delta 1408 fares Opens this date on Aviasales

  4. #4 · Delta 2009

    1:50 PM → 3:23 PM2h 36m nonstop

    Local times, typical schedule. Last flown 2026-05-06.

    81%

    chance on time

    On time (history)
    84%
    Cancelled
    2.8%
    Avg arrival delay
    8 min
    • Arrived on time 84% of the time (140 flights, Jun 2025 to May 2026).
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Moderate track record · 140 flights

    Find Delta 2009 fares Opens this date on Aviasales

  5. #5 · Southwest 4389

    1:35 PM → 3:10 PM2h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    80%

    chance on time

    On time (history)
    74%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 74% of the time (23 flights, Jun 2025 to May 2026).
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 4389 fares Opens this date on Aviasales

  6. #6 · Delta 1084

    1:26 PM → 2:57 PM2h 31m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    79%

    chance on time

    On time (history)
    72%
    Cancelled
    0.0%
    Avg arrival delay
    11 min
    • Arrived on time 72% of the time (25 flights, Jun 2025 to May 2026).
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (25 flights), so its score leans on the airline's record at this hour.

    Limited track record · 25 flights

    Find Delta 1084 fares Opens this date on Aviasales

  7. #7 · Southwest 1758

    3:10 PM → 4:55 PM2h 45m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    78%

    chance on time

    On time (history)
    82%
    Cancelled
    0.0%
    Avg arrival delay
    9 min
    • Arrived on time 82% of the time (33 flights, Jun 2025 to May 2026).
    • Never cancelled in 33 scheduled flights.
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (33 flights), so its score leans on the airline's record at this hour.

    Limited track record · 33 flights

    Find Southwest 1758 fares Opens this date on Aviasales

  8. #8 · Delta 1508

    11:10 PM → 12:38 AM2h 36m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    77%

    chance on time

    On time (history)
    78%
    Cancelled
    1.1%
    Avg arrival delay
    12 min
    • Arrived on time 78% of the time (351 flights, Jun 2025 to May 2026).
    • Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).

    Strong track record · 351 flights

    Find Delta 1508 fares Opens this date on Aviasales

  9. #9 · Southwest 267

    2:10 PM → 3:45 PM2h 35m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    76%

    chance on time

    On time (history)
    65%
    Cancelled
    0.0%
    Avg arrival delay
    13 min
    • Arrived on time 65% of the time (23 flights, Jun 2025 to May 2026).
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 267 fares Opens this date on Aviasales

  10. #10 · Delta 1465

    3:44 PM → 5:21 PM2h 34m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    74%

    chance on time

    On time (history)
    75%
    Cancelled
    1.4%
    Avg arrival delay
    11 min
    • Arrived on time 75% of the time (353 flights, Jun 2025 to May 2026).
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 353 flights

    Find Delta 1465 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines82%

    329 flights · 83% on time as flown · 0.7% cancel

  • Spirit Airlines81%

    38 flights · 79% on time as flown · 1.2% cancel

  • Delta Air Lines78%

    2,611 flights · 79% on time as flown · 1.6% cancel

  • Frontier Airlines71%

    101 flights · 69% on time as flown · 1.7% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM88%

    333 flights · avg delay 6 min

  • 9 AM to noon86%

    569 flights · avg delay 9 min

  • Noon to 3 PM81%

    704 flights · avg delay 12 min

  • 3 to 6 PM76%

    566 flights · avg delay 15 min

  • 6 to 9 PM70%

    507 flights · avg delay 19 min

  • After 9 PM78%

    400 flights · avg delay 13 min

Best day: Wednesday (83%). Worst: Sunday (75%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
80
F
85
M
80
A
79
M
70
J
70
J
67
A
81
S
85
O
90
N
86
D
81

What delays this route

  • Airline (crew, maintenance, boarding)44%
  • Late-arriving aircraft34%
  • Air traffic control and airport volume16%
  • Severe weather5%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

ATL to SAT questions

What time of day is best to fly ATL to SAT?
Before 9 AM: 88% of flights arrived on time, against 70% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from ATL to SAT?
Southwest, with a season-adjusted 82% chance of operating and arriving on time over 329 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on ATL to SAT?
July (67% on time); the best was October (90%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from ATL

Live status: FAA delays and ground stops