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Route on-time record

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

Seattle (Seattle–Tacoma International Airport) to Fort Lauderdale (Fort Lauderdale Hollywood International Airport). 826 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 1.0% were cancelled. The most reliable flight number was Alaska 517 at 8:00 AM.

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

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SEA → FLL

Seattle to Fort Lauderdale: 826 nonstop flights a year

On time (12 months)

77%

Cancelled

1.0%

avg delay 12 min

Best time to leave

Noon to 3 PM

84% on time vs 66% 9 AM to noon

Most reliable airline

Alaska

80% chance on time

Check SEA to FLL 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 517

    8:00 AM → 5:05 PM6h 05m nonstop

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

    84%

    chance on time

    On time (history)
    89%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 89% of the time (19 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 FLL's trouble window: 70% of its 20 ground stops and delay programs started between 1 PM and 7 PM.

    Limited track record · 19 flights

    Find Alaska 517 fares Opens this date on Aviasales

  2. #2 · Alaska 516

    8:13 AM → 5:23 PM5h 54m nonstop

    Local times, typical schedule. Last flown 2026-05-12.

    82%

    chance on time

    On time (history)
    82%
    Cancelled
    0.6%
    Avg arrival delay
    9 min
    • Arrived on time 82% of the time (341 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 FLL's trouble window: 70% of its 20 ground stops and delay programs started between 1 PM and 7 PM.

    Strong track record · 341 flights

    Find Alaska 516 fares Opens this date on Aviasales

  3. #3 · Delta 338

    11:59 AM → 8:41 PM5h 46m nonstop

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

    72%

    chance on time

    On time (history)
    74%
    Cancelled
    1.6%
    Avg arrival delay
    15 min
    • Arrived on time 74% of the time (355 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (9 AM to noon: 66% on time; Noon to 3 PM: 84%).
    • 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 · 355 flights

    Find Delta 338 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Alaska Airlines80%

    462 flights · 80% on time as flown · 0.6% cancel

  • Delta Air Lines73%

    364 flights · 74% on time as flown · 1.4% cancel

On time by departure time

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

  • Before 9 AM82%

    490 flights · avg delay 11 min

  • 9 AM to noon66%

    190 flights · avg delay 17 min

  • Noon to 3 PM84%

    49 flights · avg delay 7 min

  • After 9 PM72%

    96 flights · avg delay 13 min

Best day: Tuesday (85%). 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
77
F
82
M
77
A
79
M
86
J
80
J
81
A
79
S
89
O
89
N
83
D
74

What delays this route

  • Airline (crew, maintenance, boarding)46%
  • Air traffic control and airport volume35%
  • Late-arriving aircraft19%

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

Finding the most reliable connections from SEA to FLL…

SEA to FLL questions

What time of day is best to fly SEA to FLL?
Noon to 3 PM: 84% of flights arrived on time, against 66% for departures 9 AM to noon.
Which airline is most on time from SEA to FLL?
Alaska, with a season-adjusted 80% chance of operating and arriving on time over 462 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 FLL?
December (74% on time); the best was September (89%), 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.

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Live status: FAA delays and ground stops