BTS DATA COMPLETE THROUGH JUNE 2026HISTORICAL ODDS · NOT LIVE FLIGHT STATUS
DelayOddsKnow the route before you book
EWR→SEA

Newark, NJ (EWR) to Seattle, WA (SEA) flight delay odds

71.9% of 2,234 official scheduled EWR-to-SEA flights arrived on time; 16.5% arrived at least 30 minutes late and 2.0% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALGenerally reliable
71.9%arrived on time
16.5%30+ min late
2.0%cancelled
2,234scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.4%all scheduled flights
120+ minutes late3.3%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+7.0 mincompleted flights

Which departure time was most reliable for EWR to SEA?

Among qualifying EWR-to-SEA departure window results, Late morning had the highest on-time rate: 86.1% of 231 flights. Evening was lowest at 62.4% across 896 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning63477.1%11.5%1.3%
Late morning23186.1%8.2%0.4%
Afternoon47376.1%14.2%2.7%
Evening89662.4%23.4%2.6%

Which weekday was most reliable for EWR to SEA?

Among qualifying EWR-to-SEA weekday results, Tuesday had the highest on-time rate: 74.6% of 323 flights. Sunday was lowest at 66.8% across 328 flights.

DayFlightsOn time30+ minCancelled
Monday32671.8%17.5%2.8%
Tuesday32374.6%14.9%0.9%
Wednesday31374.1%15.7%1.0%
Thursday32573.2%16.6%2.8%
Friday32671.2%16.6%0.9%
Saturday29372.0%16.0%1.7%
Sunday32866.8%18.3%4.0%

Which airline was most reliable for EWR to SEA?

Among qualifying EWR-to-SEA airline results, United Airlines had the highest on-time rate: 76.1% of 997 flights. Alaska Airlines was lowest at 68.6% across 1,237 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines1,23768.6%18.2%2.8%
United Airlines99776.1%14.4%1.0%

Which month was most reliable for EWR to SEA?

Among qualifying EWR-to-SEA month results, April 2026 had the highest on-time rate: 89.5% of 181 flights. December 2025 was lowest at 44.4% across 178 flights.

MonthFlightsOn time30+ minCancelled
July 202521765.9%26.7%3.7%
August 202522976.4%13.1%0.9%
September 202522785.9%8.4%0.9%
October 202520670.9%16.0%1.9%
November 202517160.2%24.6%4.7%
December 202517844.4%33.1%1.7%
January 202611977.3%12.6%4.2%
February 202610374.8%11.7%7.8%
March 202616548.5%27.3%0.6%
April 202618189.5%3.9%1.1%
May 202621387.8%6.1%0.0%
June 202622574.7%16.0%0.9%

What drove EWR to SEA delay minutes?

National airspace was the largest recorded EWR-to-SEA delay category, accounting for 37.7% of 36,881 BTS-attributed delay minutes during July 2025–June 2026.

Airline17.8%
Late aircraft36.2%
National airspace37.7%
Weather7.3%
Security1.1%
This is historical evidence, not a forecast.

Weather, schedules and operations change. For a trip you have already booked, use the airline or airport for live status.