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Route on-time record

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

Seattle (Seattle–Tacoma International Airport) to Cincinnati / Covington (Cincinnati Northern Kentucky International Airport). 791 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was Delta 558 at 11:45 AM.

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

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SEA → CVG

Seattle to Cincinnati / Covington: 791 nonstop flights a year

On time (12 months)

81%

Cancelled

0.9%

avg delay 11 min

Best time to leave

Noon to 3 PM

85% on time vs 51% after 9 PM

Most reliable airline

Delta

86% chance on time

Check SEA to CVG 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 558

    11:45 AM → 7:04 PM4h 19m nonstop

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

    87%

    chance on time

    On time (history)
    87%
    Cancelled
    0.6%
    Avg arrival delay
    10 min
    • Arrived on time 87% 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).

    Strong track record · 341 flights

    Find Delta 558 fares Opens this date on Aviasales

  2. #2 · Alaska 508

    11:06 AM → 6:29 PM4h 23m nonstop

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

    79%

    chance on time

    On time (history)
    80%
    Cancelled
    1.1%
    Avg arrival delay
    10 min
    • Arrived on time 80% of the time (355 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 · 355 flights

    Find Alaska 508 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Delta Air Lines86%

    362 flights · 88% on time as flown · 0.8% cancel

  • Alaska Airlines76%

    429 flights · 75% on time as flown · 0.9% cancel

On time by departure time

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

  • 9 AM to noon84%

    654 flights · avg delay 11 min

  • Noon to 3 PM85%

    69 flights · avg delay 6 min

  • After 9 PM51%

    68 flights · avg delay 26 min

Best day: Wednesday (86%). 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
81
F
89
M
89
A
81
M
82
J
83
J
75
A
77
S
86
O
89
N
90
D
83

What delays this route

  • Airline (crew, maintenance, boarding)50%
  • Late-arriving aircraft31%
  • Air traffic control and airport volume19%

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 CVG…

SEA to CVG questions

What time of day is best to fly SEA to CVG?
Noon to 3 PM: 85% of flights arrived on time, against 51% for departures after 9 PM.
Which airline is most on time from SEA to CVG?
Delta, with a season-adjusted 86% chance of operating and arriving on time over 362 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 CVG?
July (75% 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.

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Live status: FAA delays and ground stops