Historical on-time performance
Charleston to Seattle
2,415 miData through Dec 2025Source: US DOT · BTS
Flights on CHS–SEA arrive on time 67% of the time over the last 12 months.
On-time rate67%arrived within 15 min
p90 delay40 min1 in 10 flights is worse (tail risk)
Cancelled0.7%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-time67%Medianon timep9040 minCancel0.7%Flights275
Why flights run late
Delay causes
- Airline12%
- Weather9%
- Air traffic (NAS)34%
- Late aircraft43%
- Security2%
Most delay minutes here are attributed to Late aircraft.
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly CHS → SEA
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Afternoons are the most reliable time of day to fly this route — 84% on time.
- Afternoons84% on time · p90 25 min · 193 flights · limited
- Evenings75% on time · p90 30 min · 854 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 86% on time.
- Saturdays86% on time · p90 15 min · 141 flights · limited
- Tuesdays81% on time · p90 25 min · 125 flights · limited
- Thursdays77% on time · p90 30 min · 154 flights · limited
- Fridays77% on time · p90 30 min · 156 flights · limited
- Wednesdays76% on time · p90 25 min · 157 flights · limited
- Sundays71% on time · p90 40 min · 157 flights · limited
- Mondays70% on time · p90 35 min · 157 flights · limited
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