How often are SEA to EWR flights on time?

Flights from Seattle (SEA) to Newark (EWR) arrive on time 90% of the time across 11,540 flights of official data.

Which airline is most reliable on the SEA to EWR route?

United Airlines has the best on-time record on this route at 91% across 5,549 flights.

Route reliability

Flights from Seattle to Newark arrive on time 90% of the time across 11,540 flights. Here’s how each airline really performs.

0.0

On-time rate

11,540 flights

Airline	On-time	Flights
United Airlines	91%	5,549
Alaska Airlines	90%	5,991

On-time = arrived within 15 minutes of schedule, per BTS TranStats. Compare the reverse leg EWR → SEA.

How to Pick a Reliable Flight (Not Just the Cheapest)

A practical checklist for booking the flight that gets you there — not just the cheap one.

Nonstop vs. Connecting Flights: The Reliability Trade-off

A stop multiplies the ways a trip can break. When it's worth it — and how to de-risk it.

Do Morning Flights Really Have Fewer Delays?

Yes — and there's a clear reason. How delays snowball through the day.

Are Some Airlines Really More Reliable Than Others?

The reliability gap between airlines is real — here's what actually drives it.

Score real SEA–EWR flights on reliability, weather, and connection safety — not just price.

Opens a partner site; we may earn a commission if you book there. It's a general fare search — nothing on it is scored.