Route on-time record
SEA to CHS: most on-time flights and the best time to fly
Seattle (Seattle–Tacoma International Airport) to Charleston (Charleston International Airport). 347 nonstop flights in Jun 2025 to May 2026, 85% arrived within 15 minutes and 0.3% were cancelled. The most reliable flight number was Alaska 787 at 9:38 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SEA → CHS
Seattle to Charleston: 347 nonstop flights a year
On time (12 months)
85%
Cancelled
0.3%
avg delay 7 min
Best time to leave
9 AM to noon
91% on time vs 70% before 9 AM
Most reliable airline
Alaska
84% chance on time
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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 · Alaska 787
9:38 AM → 5:53 PM5h 18m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 95%
- Cancelled
- 0.0%
- Avg arrival delay
- 3 min
- Arrived on time 95% of the time (135 flights, Jun 2025 to May 2026).
- Never cancelled in 135 scheduled flights.
- Leaves in this route's most on-time window (9 AM to noon: 91% on time; Before 9 AM: 70%).
- 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 · 135 flights
Find Alaska 787 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Alaska Airlines84%
347 flights · 85% on time as flown · 0.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM70%
112 flights · avg delay 14 min
- 9 AM to noon91%
235 flights · avg delay 4 min
Best day: Tuesday (88%). Worst: Sunday (81%).
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.
What delays this route
- Airline (crew, maintenance, boarding)45%
- Air traffic control and airport volume27%
- Late-arriving aircraft26%
- Severe weather1%
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 CHS questions
- What time of day is best to fly SEA to CHS?
- 9 AM to noon: 91% of flights arrived on time, against 70% for departures before 9 AM.
- Which airline is most on time from SEA to CHS?
- Alaska, with a season-adjusted 84% 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 SEA to CHS?
- July (70% on time); the best was February (93%), 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
- CHS to SEA (return)
- SEA to LAX 83%
- SEA to PHX 79%
- SEA to SFO 69%
- SEA to ANC 74%
- SEA to DEN 77%
- SEA to LAS 77%
- SEA to ORD 75%
- SEA to GEG 81%
- SEA to DFW 77%
- SEA to PDX 82%
- SEA to SAN 78%
- SEA to SMF 81%
Most on-time flights from SEA on every route →
Live status: FAA delays and ground stops