Historical on-time performance
Seattle to Charleston
2,415 miData through Dec 2025Source: US DOT · BTS
Flights on SEA–CHS arrive on time 76% of the time over the last 12 months.
On-time rate76%arrived within 15 min
p90 delay30 min1 in 10 flights is worse (tail risk)
Cancelled0.4%of scheduled flights
based on 275 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Alaska AirlinesOn-time76%Medianon timep9030 minCancel0.4%Flights275
Why flights run late
Delay causes
- Airline45%
- Weather0%
- Air traffic (NAS)27%
- Late aircraft28%
- Security0%
Most delay minutes here are attributed to Airline.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly SEA → CHS
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best day of week
On-time rates are fairly even by day on this route — ranging from 77% to 86% on time.
- Tuesdays86% on time · p90 15 min · 125 flights · limited
- Fridays81% on time · p90 30 min · 156 flights · limited
- Wednesdays81% on time · p90 20 min · 157 flights · limited
- Saturdays79% on time · p90 25 min · 141 flights · limited
- Sundays79% on time · p90 30 min · 157 flights · limited
- Mondays79% on time · p90 30 min · 157 flights · limited
- Thursdays77% on time · p90 20 min · 154 flights · limited
Advertisement
Keep exploring