Seattle (SEA) to Charleston (CHS): On-Time Performance
Data through July 2026
Seattle (SEA) to Charleston (CHS) is a thinner route than most in this dataset — 347 departures over the past year, roughly 7 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 82% arrived on time.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 8 min
- completed flights
- Cancelled
- 0.6%
- Flights/day
- 0.95
- last 12 months
- Duration
- 5h 14m
- scheduled
- Distance
- 2,415 mi
Monthly on-time trend
Best time to fly from SEA to CHS
Aim for departures around 10 a.m. (90% on-time); avoid 8 a.m. departures (73%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 83% | 9 min |
| Tuesdaybest | 87% | 6 min |
| Wednesday | 83% | 7 min |
| Thursday | 79% | 8 min |
| Friday | 82% | 11 min |
| Saturday | 82% | 8 min |
| Sunday | 79% | 10 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft28%
- Airline operations35%
- National airspace system37%
- Weather1%
Frequently asked questions
- How often are flights from SEA to CHS delayed?
- 18% of SEA–CHS flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 8 minutes.
- What is the best time of day to fly from SEA to CHS?
- Departures around 10 a.m. have the best record (90% on-time), while departures around 8 a.m. have the worst (73%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to CHS?
- The scheduled SEA–CHS flight time averages 5h 14m over 2,415 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are SEA to CHS flights cancelled?
- 0.6% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to CHS?
- July 2025 was the roughest month in this dataset, with only 52% of arrivals on time. The best was February 2026 at 100%. If your dates are flexible, that 48-point gap is worth planning around.
Explore related pages
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Related guides
Based on 727 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.