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Route on-time record

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

Charleston (Charleston International Airport) to Seattle (Seattle–Tacoma International Airport). 347 nonstop flights in Jun 2025 to May 2026, 69% arrived within 15 minutes and 0.9% were cancelled. The most reliable flight number was Alaska 787 at 6:53 PM.

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

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CHS → SEA

Charleston to Seattle: 347 nonstop flights a year

On time (12 months)

69%

Cancelled

0.9%

avg delay 13 min

Best time to leave

No clear winner

Most reliable airline

Alaska

69% chance on time

Check CHS 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 787

    6:53 PM → 10:02 PM6h 09m nonstop

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

    73%

    chance on time

    On time (history)
    76%
    Cancelled
    0.7%
    Avg arrival delay
    9 min
    • Arrived on time 76% of the time (133 flights, Jun 2025 to May 2026).

    Moderate track record · 133 flights

    Find Alaska 787 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Alaska Airlines69%

    347 flights · 69% on time as flown · 0.9% cancel

On time by departure time

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

  • 6 to 9 PM69%

    347 flights · avg delay 13 min

Best day: Saturday (85%). Worst: Monday (71%).

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
85
F
89
M
87
A
67
M
71
J
74
J
65
A
70
S
79
O
87
N
72
D
78

What delays this route

  • Air traffic control and airport volume43%
  • Late-arriving aircraft35%
  • Airline (crew, maintenance, boarding)13%
  • Severe weather6%
  • Security2%

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 CHS to SEA…

CHS to SEA questions

Which airline is most on time from CHS to SEA?
Alaska, with a season-adjusted 69% chance of operating and arriving on time over 347 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 CHS to SEA?
July (65% on time); the best was February (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.

More routes from CHS

Most on-time flights from CHS on every route →

Live status: FAA delays and ground stops