Historical on-time performance
Charleston to Seattle
2,415 miData through May 2026Source: US DOT · BTS
Flights on CHS–SEA arrive on time 68% of the time over the last 12 months.
On-time rate68%arrived within 15 min
p90 delay35 min1 in 10 flights is worse (tail risk)
Cancelled1.1%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-time68%Medianon timep9035 minCancel1.1%Flights275
Why flights run late
Delay causes
- Airline14%
- Weather7%
- Air traffic (NAS)41%
- Late aircraft36%
- Security2%
Most delay minutes here are attributed to Air traffic (NAS).
When flights don't go
Why flights were cancelled
- Airline67%
- Weather33%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 3 cancellations with a reported cause (BTS reports causes from June 2003).
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 (2023-06 .. 2026-05).
Best time of day
Afternoons are the most reliable time of day to fly this route — 85% on time.
- Afternoons85% on time · p90 20 min · 130 flights · limited
- Evenings74% on time · p90 30 min · 917 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 84% on time.
- Saturdays84% on time · p90 20 min · 137 flights · limited
- Tuesdays78% on time · p90 25 min · 129 flights · limited
- Fridays76% on time · p90 35 min · 157 flights · limited
- Wednesdays76% on time · p90 25 min · 156 flights · limited
- Thursdays75% on time · p90 30 min · 155 flights · limited
- Sundays71% on time · p90 35 min · 157 flights · limited
- Mondays70% on time · p90 35 min · 156 flights · limited
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