EWR (Newark) to SEA (Seattle) flights arrive on time 75% of the time. The most reliable airline on this route is United Airlines at 77%. The average delay is 71 minutes. Delays on this route are most often caused by the incoming plane arriving late.
Source: Bureau of Transportation Statistics. Updated October 2026.EWR → SEA
EWR (Newark) to SEA (Seattle)
EWR → SEA on-time performance by month
24
25
26
JanFebMarAprMayJunJulAugSepOctNovDec
Worse
Better
This route is on time most of the time. About 75% of flights arrive on schedule.
Delays on this route are most often caused by the incoming plane arriving late.
Accurate?
Airlines are roughly equal on this route — United Airlines leads slightly at 77% vs Alaska Airlines at 75%.
Airline Comparison
United Airlines leads at 77% on time; Alaska Airlines trails at 75%.
Accurate?
Good to know
Departing from EWR
78% on timeExpect ~22 min sitting on the taxiway after your gate pushes back. EWR has long runway queues.
TSA is currently ~42 min. Best time: 4 AM (about 5 min).
EWR cancels 2.8% of flights — higher than average. Have a backup plan.
Arriving at SEA
81% on timeWhen flights into SEA are late, the average delay is 58 minutes. Build buffer if you have ground plans.
If connecting at SEA: TSA is ~15 min right now. Allow at least 60 minutes for a domestic connection.
Flight cancelled or delayed?
Check what United Airlines owes you — refund rights, action plan, complaint email. Free.
Flying out of EWR? We'll brief you.
Delays, TSA, weather, gates — we'll let you know if something matters.
Know someone flying soon?
Send them the link — delay data, TSA waits, weather, all free.
Data last updated October 2026. Source: Bureau of Transportation Statistics.