Historical on-time performance
Seattle to Philadelphia
Flights on SEA–PHL arrive on time 78% of the time over the last 12 months.
based on 1,160 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.
- American AirlinesOn-time80%Medianon timep9030 minCancel1.7%Flights532
- Alaska AirlinesOn-time76%Medianon timep9035 minCancel1.1%Flights628
Why flights run late
Delay causes
- Airline31%
- Weather13%
- Air traffic (NAS)18%
- Late aircraft38%
- Security0%
Most delay minutes here are attributed to Late aircraft.
When flights don't go
Why flights were cancelled
- Airline31%
- Weather69%
- Air traffic (NAS)0%
- Security0%
Most cancellations here are attributed to Weather. Shares are among 16 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 SEA → PHL
All airlines · rolling 36 months (2023-06 .. 2026-05).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 72% to 75% on time.
- Overnights75% on time · p90 35 min · 1,781 flights
- Mornings73% on time · p90 30 min · 1,209 flights
- Middays72% on time · p90 45 min · 384 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 70% to 79% on time.
- Wednesdays79% on time · p90 25 min · 476 flights
- Tuesdays78% on time · p90 25 min · 457 flights
- Saturdays74% on time · p90 30 min · 467 flights
- Thursdays73% on time · p90 35 min · 493 flights
- Mondays72% on time · p90 35 min · 488 flights
- Fridays71% on time · p90 45 min · 499 flights
- Sundays70% on time · p90 40 min · 498 flights
Keep exploring