Historical on-time performance
Pittsburgh to Seattle
2,125 miData through Dec 2025Source: US DOT · BTS
Flights on PIT–SEA arrive on time 68% of the time over the last 12 months.
On-time rate68%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.1%of scheduled flights
based on 375 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 timep9055 minCancel1.1%Flights375
Why flights run late
Delay causes
- Airline20%
- Weather3%
- Air traffic (NAS)19%
- Late aircraft58%
- Security0%
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 PIT → SEA
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
Mornings are the most reliable time of day to fly this route — 83% on time.
- Mornings83% on time · p90 25 min · 505 flights
- Evenings74% on time · p90 40 min · 884 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 84% on time.
- Wednesdays84% on time · p90 30 min · 202 flights
- Tuesdays82% on time · p90 25 min · 187 flights · limited
- Mondays79% on time · p90 35 min · 209 flights
- Fridays75% on time · p90 35 min · 209 flights
- Thursdays74% on time · p90 35 min · 193 flights · limited
- Sundays73% on time · p90 35 min · 198 flights · limited
- Saturdays72% on time · p90 45 min · 192 flights · limited
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