SEA to EWR flight delays
Seattle, WA (SEA) Newark, NJ (EWR) · 2,402 miles
225 flights · March 2025 – August 2026 · US Bureau of Transportation Statistics
83.33%
Arrived on time
Within 15 minutes of schedule
0.89%
Cancelled
Share of scheduled flights
57 min
When late, late by
Average across delayed arrivals
10 min
Delay per flight
Averaged over every flight flown
What the record says about this route
Which airline you fly changes the odds here. United Airlines arrived on time 6 points more often than Alaska Airlines over the same period on the same route — same airports, same weather, same air traffic control. A gap that survives all of that is about how the two airlines are run.
The two directions do not behave alike. EWR to SEA arrives on time 8 points less often than the outbound. Delay accumulates through the flying day, so whichever direction is scheduled later tends to carry the worse record — which is an argument for booking the morning departure if the choice exists.
This route does better than its own airport. Departures from SEA overall run 9 points less punctual than this particular one — so whatever congestion SEA has, this route is largely escaping it.
This is a thin route — 225 flights across the whole period. On a route this infrequent a cancellation is far more costly than the rate suggests, because the next departure may not be the same day.
Which airline should you fly on this route?
Over March 2025 – August 2026, United Airlines arrived on time most often on SEA to EWR. Alaska Airlines was late most often.
Every airline on SEA to EWR
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Alaska Airlines | 120 | 80.51% | 1.67% | 42 min | C |
| United Airlines | 105 | 86.54% | 0% | 82 min | A |
The return leg
EWR to SEA Newark back to Seattle 75.34% on time COther routes from Seattle
Common questions
Are flights from Seattle to Newark usually delayed?
83.33% of flights on the SEA to EWR route arrived within 15 minutes of schedule, so roughly 2 in every ten arrived late. That is better than the average route in this record.
Which airline is most on time from Seattle to Newark?
United Airlines, at 86.54% on time across 105 flights. The least punctual on the route was Alaska Airlines at 80.51%.
How often are SEA to EWR flights cancelled?
0.89% of scheduled flights did not operate — about 9 in every thousand. That is in the normal range.
When SEA to EWR flights are late, how late are they?
About 57 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on SEA to EWR during March 2025 – August 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →