Historical on-time performance
Pittsburgh to Seattle
2,125 miData through May 2026Source: US DOT · BTS
Flights on PIT–SEA arrive on time 69% of the time over the last 12 months.
On-time rate69%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 346 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Alaska AirlinesOn-time69%Medianon timep9055 minCancel1.2%Flights346
Why flights run late
Delay causes
- Airline21%
- Weather4%
- Air traffic (NAS)16%
- Late aircraft60%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline100%
- Weather0%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Airline. Shares are among 4 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 PIT → SEA
All airlines · rolling 36 months (2023-06 .. 2026-05).
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 · 551 flights
- Evenings71% on time · p90 45 min · 848 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 72% to 81% on time.
- Tuesdays81% on time · p90 25 min · 183 flights · limited
- Wednesdays81% on time · p90 30 min · 204 flights
- Mondays76% on time · p90 40 min · 210 flights
- Saturdays73% on time · p90 45 min · 191 flights · limited
- Fridays73% on time · p90 35 min · 213 flights
- Thursdays72% on time · p90 40 min · 198 flights · limited
- Sundays72% on time · p90 45 min · 201 flights
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