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Route on-time record

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

Atlanta (Hartsfield Jackson Atlanta International Airport) to Seattle (Seattle–Tacoma International Airport). 3,281 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 0.7% were cancelled. The most reliable flight number was Alaska 377 at 7:00 AM.

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

ATL → SEA

Atlanta to Seattle: 3,281 nonstop flights a year

On time (12 months)

77%

Cancelled

0.7%

avg delay 14 min

Best time to leave

Before 9 AM

84% on time vs 64% 6 to 9 PM

Most reliable airline

Delta

79% chance on time

Check ATL to SEA 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 · Alaska 377

    7:00 AM → 9:59 AM5h 39m nonstop

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

    83%

    chance on time

    On time (history)
    84%
    Cancelled
    0.3%
    Avg arrival delay
    13 min
    • Arrived on time 84% of the time (314 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 6 to 9 PM: 64%).
    • 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 · 314 flights

    Find Alaska 377 fares Opens this date on Aviasales

  2. #2 · Delta 481

    4:28 PM → 6:58 PM5h 25m nonstop

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

    83%

    chance on time

    On time (history)
    83%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 83% of the time (308 flights, Jun 2025 to May 2026).
    • Never cancelled in 308 scheduled flights.
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.

    Strong track record · 308 flights

    Find Delta 481 fares Opens this date on Aviasales

  3. #3 · Delta 774

    9:55 AM → 12:33 PM5h 34m nonstop

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

    82%

    chance on time

    On time (history)
    83%
    Cancelled
    0.3%
    Avg arrival delay
    9 min
    • Arrived on time 83% of the time (361 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 · 361 flights

    Find Delta 774 fares Opens this date on Aviasales

  4. #4 · Delta 444

    7:25 AM → 10:01 AM5h 30m nonstop

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

    82%

    chance on time

    On time (history)
    83%
    Cancelled
    1.7%
    Avg arrival delay
    9 min
    • Arrived on time 83% of the time (355 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 84% on time; 6 to 9 PM: 64%).
    • 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 · 355 flights

    Find Delta 444 fares Opens this date on Aviasales

  5. #5 · Delta 629

    11:20 AM → 1:57 PM5h 28m nonstop

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

    80%

    chance on time

    On time (history)
    80%
    Cancelled
    0.3%
    Avg arrival delay
    10 min
    • Arrived on time 80% of the time (363 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 · 363 flights

    Find Delta 629 fares Opens this date on Aviasales

  6. #6 · Alaska 457

    9:00 AM → 11:31 AM5h 31m nonstop

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

    79%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 94% of the time (18 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).
    • Short track record (18 flights), so its score leans on the airline's record at this hour.

    Limited track record · 18 flights

    Find Alaska 457 fares Opens this date on Aviasales

  7. #7 · Delta 903

    9:40 PM → 11:59 PM5h 32m nonstop

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

    77%

    chance on time

    On time (history)
    78%
    Cancelled
    1.6%
    Avg arrival delay
    13 min
    • Arrived on time 78% of the time (250 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 · 250 flights

    Find Delta 903 fares Opens this date on Aviasales

  8. #8 · Delta 472

    3:59 PM → 6:20 PM5h 21m nonstop

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

    74%

    chance on time

    On time (history)
    74%
    Cancelled
    0.0%
    Avg arrival delay
    18 min
    • Arrived on time 74% of the time (173 flights, Jun 2025 to May 2026).
    • Never cancelled in 174 scheduled flights.
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.

    Moderate track record · 173 flights

    Find Delta 472 fares Opens this date on Aviasales

  9. #9 · Delta 714

    7:33 PM → 10:05 PM5h 32m nonstop

    Local times, typical schedule. Last flown 2026-05-24. Same departure also flew as Delta 2524; its record covers all of them.

    70%

    chance on time

    On time (history)
    72%
    Cancelled
    0.3%
    Avg arrival delay
    16 min
    • Arrived on time 72% of the time (305 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 64% on time; Before 9 AM: 84%).
    • 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 · 305 flights

    Find Delta 714 fares Opens this date on Aviasales

  10. #10 · Alaska 263

    4:34 PM → 7:05 PM5h 35m nonstop

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

    70%

    chance on time

    On time (history)
    73%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 73% of the time (40 flights, Jun 2025 to May 2026).
    • Never cancelled in 40 scheduled flights.
    • Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
    • Lands inside SEA's trouble window: 54% of its 68 ground stops and delay programs started between 4 PM and 10 PM.

    Limited track record · 40 flights

    Find Alaska 263 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines79%

    2,375 flights · 79% on time as flown · 0.6% cancel

  • Alaska Airlines72%

    906 flights · 72% on time as flown · 1.0% cancel

On time by departure time

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

  • Before 9 AM84%

    706 flights · avg delay 11 min

  • 9 AM to noon80%

    873 flights · avg delay 12 min

  • Noon to 3 PM83%

    393 flights · avg delay 9 min

  • 3 to 6 PM75%

    378 flights · avg delay 15 min

  • 6 to 9 PM64%

    680 flights · avg delay 21 min

  • After 9 PM79%

    251 flights · avg delay 13 min

Best day: Wednesday (83%). Worst: Sunday (77%).

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
79
F
80
M
81
A
84
M
75
J
72
J
69
A
79
S
88
O
89
N
90
D
81

What delays this route

  • Airline (crew, maintenance, boarding)48%
  • Air traffic control and airport volume25%
  • Late-arriving aircraft21%
  • 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 SEA questions

What time of day is best to fly ATL to SEA?
Before 9 AM: 84% of flights arrived on time, against 64% 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 SEA?
Delta, with a season-adjusted 79% 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 ATL to SEA?
July (69% on time); the best was November (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