Historical on-time performance
Seattle to Newark
2,401 miData through Dec 2025Source: US DOT · BTS
Flights on SEA–EWR arrive on time 75% of the time over the last 12 months.
On-time rate75%arrived within 15 min
p90 delay60 min1 in 10 flights is worse (tail risk)
Cancelled1.2%of scheduled flights
based on 2,007 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.
- United AirlinesOn-time76%Medianon timep9065 minCancel0.3%Flights911
- Alaska AirlinesOn-time74%Medianon timep9055 minCancel2.0%Flights1,096
Why flights run late
Delay causes
- Airline21%
- Weather7%
- Air traffic (NAS)55%
- Late aircraft17%
- 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 SEA → EWR
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 · 2,309 flights
- Overnights76% on time · p90 35 min · 2,141 flights
- Afternoons68% on time · p90 80 min · 149 flights · limited
- Middays66% on time · p90 85 min · 1,527 flights
Best day of week
On-time rates are fairly even by day on this route — ranging from 71% to 82% on time.
- Tuesdays82% on time · p90 25 min · 876 flights
- Wednesdays81% on time · p90 30 min · 875 flights
- Mondays77% on time · p90 35 min · 894 flights
- Saturdays76% on time · p90 50 min · 808 flights
- Fridays73% on time · p90 50 min · 897 flights
- Sundays72% on time · p90 55 min · 899 flights
- Thursdays71% on time · p90 45 min · 880 flights
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