Historical on-time performance
Newark to Seattle
2,402 miData through Dec 2025Source: US DOT · BTS
Flights on EWR–SEA arrive on time 69% of the time over the last 12 months.
On-time rate69%arrived within 15 min
p90 delay65 min1 in 10 flights is worse (tail risk)
Cancelled1.7%of scheduled flights
based on 2,006 flights over the last 12 months. On-time means arriving within 15 minutes (BTS standard).
By airline
How each carrier compares
- Alaska AirlinesOn-time63%Medianon timep9080 minCancel3.0%Flights1,095
- United AirlinesbestOn-time77%Medianon timep9050 minCancel0.2%Flights911
Why flights run late
Delay causes
- Airline16%
- Weather6%
- Air traffic (NAS)30%
- Late aircraft47%
- Security1%
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 EWR → SEA
All airlines · rolling 36 months (2023-01 .. 2025-12).
Best time of day
On-time rates are fairly even by time of day on this route — ranging from 45% to 82% on time.
- Middays82% on time · p90 30 min · 276 flights
- Mornings82% on time · p90 30 min · 2,050 flights
- Afternoons76% on time · p90 55 min · 1,439 flights
- Evenings62% on time · p90 80 min · 2,271 flights
- Overnights45% on time · p90 110 min · 91 flights · limited
Best day of week
On-time rates are fairly even by day on this route — ranging from 69% to 78% on time.
- Tuesdays78% on time · p90 40 min · 875 flights
- Wednesdays75% on time · p90 50 min · 874 flights
- Mondays73% on time · p90 60 min · 896 flights
- Sundays73% on time · p90 55 min · 896 flights
- Fridays70% on time · p90 65 min · 894 flights
- Thursdays70% on time · p90 55 min · 881 flights
- Saturdays69% on time · p90 70 min · 811 flights
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