Historical on-time performance
Philadelphia to Seattle
2,378 miData through Dec 2025Source: US DOT · BTS
Flights on PHL–SEA arrive on time 65% of the time over the last 12 months.
On-time rate65%arrived within 15 min
p90 delay55 min1 in 10 flights is worse (tail risk)
Cancelled1.0%of scheduled flights
based on 999 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
Too close to call — no single carrier is clearly more on-time here.
- Alaska AirlinesOn-time64%Medianon timep9060 minCancel0.8%Flights623
- American AirlinesOn-time68%Medianon timep9050 minCancel1.3%Flights376
Why flights run late
Delay causes
- Airline28%
- Weather3%
- Air traffic (NAS)35%
- Late aircraft34%
- Security0%
Most delay minutes here are attributed to Air traffic (NAS).
Over time
On-time trend
By season
On-time rate by month
When to fly
Best time to fly PHL → 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 — 81% on time.
- Mornings81% on time · p90 30 min · 1,173 flights
- Evenings65% on time · p90 55 min · 2,070 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 67% to 76% on time.
- Tuesdays76% on time · p90 40 min · 447 flights
- Saturdays71% on time · p90 50 min · 450 flights
- Wednesdays71% on time · p90 40 min · 456 flights
- Mondays70% on time · p90 50 min · 482 flights
- Sundays70% on time · p90 45 min · 479 flights
- Thursdays69% on time · p90 45 min · 473 flights
- Fridays67% on time · p90 55 min · 477 flights
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