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Route on-time record

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

Seattle (Seattle–Tacoma International Airport) to Atlanta (Hartsfield Jackson Atlanta International Airport). 3,280 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.7% were cancelled. The most reliable flight number was Delta 569 at 6:00 AM.

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

SEA → ATL

Seattle to Atlanta: 3,280 nonstop flights a year

On time (12 months)

82%

Cancelled

0.7%

avg delay 14 min

Best time to leave

Before 9 AM

90% on time vs 77% 3 to 6 PM

Most reliable airline

Delta

82% chance on time

Check SEA to ATL 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 569

    6:00 AM → 1:54 PM4h 41m nonstop

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

    94%

    chance on time

    On time (history)
    95%
    Cancelled
    0.8%
    Avg arrival delay
    4 min
    • Arrived on time 95% of the time (360 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 77%).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 360 flights

    Find Delta 569 fares Opens this date on Aviasales

  2. #2 · Delta 567

    9:35 PM → 5:28 AM4h 51m nonstop

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

    83%

    chance on time

    On time (history)
    82%
    Cancelled
    0.5%
    Avg arrival delay
    11 min
    • Arrived on time 82% of the time (197 flights, Jun 2025 to May 2026).
    • Departs inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.

    Moderate track record · 197 flights

    Find Delta 567 fares Opens this date on Aviasales

  3. #3 · Delta 562

    7:30 AM → 3:14 PM4h 49m nonstop

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

    83%

    chance on time

    On time (history)
    84%
    Cancelled
    0.8%
    Avg arrival delay
    27 min
    • Arrived on time 84% of the time (361 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 90% on time; 3 to 6 PM: 77%).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 361 flights

    Find Delta 562 fares Opens this date on Aviasales

  4. #4 · Alaska 334

    10:13 AM → 6:10 PM4h 57m nonstop

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

    82%

    chance on time

    On time (history)
    85%
    Cancelled
    0.3%
    Avg arrival delay
    7 min
    • Arrived on time 85% of the time (294 flights, Jun 2025 to May 2026).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).
    • Lands inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 294 flights

    Find Alaska 334 fares Opens this date on Aviasales

  5. #5 · Delta 560

    3:59 PM → 11:44 PM4h 48m nonstop

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

    82%

    chance on time

    On time (history)
    83%
    Cancelled
    0.6%
    Avg arrival delay
    14 min
    • Arrived on time 83% of the time (344 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 77% on time; Before 9 AM: 90%).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).

    Strong track record · 344 flights

    Find Delta 560 fares Opens this date on Aviasales

  6. #6 · Alaska 727

    10:05 PM → 6:00 AM4h 55m nonstop

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

    81%

    chance on time

    On time (history)
    81%
    Cancelled
    1.1%
    Avg arrival delay
    9 min
    • Arrived on time 81% of the time (175 flights, Jun 2025 to May 2026).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).

    Moderate track record · 175 flights

    Find Alaska 727 fares Opens this date on Aviasales

  7. #7 · Delta 554

    11:45 AM → 7:28 PM4h 44m nonstop

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

    81%

    chance on time

    On time (history)
    80%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 80% of the time (297 flights, Jun 2025 to May 2026).
    • Never cancelled in 302 scheduled flights.
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).

    Strong track record · 297 flights

    Find Delta 554 fares Opens this date on Aviasales

  8. #8 · Delta 652

    11:30 PM → 7:06 AM4h 43m nonstop

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

    79%

    chance on time

    On time (history)
    81%
    Cancelled
    0.9%
    Avg arrival delay
    13 min
    • Arrived on time 81% of the time (344 flights, Jun 2025 to May 2026).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).

    Strong track record · 344 flights

    Find Delta 652 fares Opens this date on Aviasales

  9. #9 · Delta 542

    1:45 PM → 9:39 PM4h 54m nonstop

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

    78%

    chance on time

    On time (history)
    79%
    Cancelled
    0.9%
    Avg arrival delay
    17 min
    • Arrived on time 79% of the time (345 flights, Jun 2025 to May 2026).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).

    Strong track record · 345 flights

    Find Delta 542 fares Opens this date on Aviasales

  10. #10 · Alaska 492

    3:59 PM → 11:59 PM5h 00m nonstop

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

    71%

    chance on time

    On time (history)
    69%
    Cancelled
    0.4%
    Avg arrival delay
    18 min
    • Arrived on time 69% of the time (231 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (3 to 6 PM: 77% on time; Before 9 AM: 90%).
    • Departs outside SEA's trouble window (4 PM to 10 PM, when 54% of its 68 ground stops and delay programs started).

    Strong track record · 231 flights

    Find Alaska 492 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines82%

    2,375 flights · 83% on time as flown · 0.7% cancel

  • Alaska Airlines78%

    905 flights · 78% on time as flown · 0.7% cancel

On time by departure time

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

  • Before 9 AM90%

    802 flights · avg delay 14 min

  • 9 AM to noon80%

    660 flights · avg delay 11 min

  • Noon to 3 PM79%

    269 flights · avg delay 17 min

  • 3 to 6 PM77%

    638 flights · avg delay 16 min

  • After 9 PM79%

    911 flights · avg delay 12 min

Best day: Tuesday (85%). Worst: Sunday (78%).

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
83
F
88
M
84
A
82
M
81
J
74
J
73
A
79
S
85
O
86
N
88
D
83

What delays this route

  • Airline (crew, maintenance, boarding)52%
  • Late-arriving aircraft26%
  • 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

SEA to ATL questions

What time of day is best to fly SEA to ATL?
Before 9 AM: 90% of flights arrived on time, against 77% for departures 3 to 6 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 SEA to ATL?
Delta, with a season-adjusted 82% chance of operating and arriving on time over 2,375 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 SEA to ATL?
July (73% on time); the best was November (88%), 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 SEA

Live status: FAA delays and ground stops