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

San Jose, CA (SJC) to Seattle, WA (SEA) flight delay odds

82.6% of 4,368 official scheduled SJC-to-SEA flights arrived on time; 9.7% arrived at least 30 minutes late and 0.8% 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 SIGNALLower disruption
82.6%arrived on time
9.7%30+ min late
0.8%cancelled
4,368scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.8%all scheduled flights
120+ minutes late1.3%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival-1.4 mincompleted flights

Which departure time was most reliable for SJC to SEA?

Among qualifying SJC-to-SEA departure window results, Early morning had the highest on-time rate: 88.9% of 1,016 flights. Night was lowest at 58.9% across 112 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,01688.9%6.1%0.5%
Late morning89486.4%6.6%1.0%
Afternoon1,23582.8%9.0%0.7%
Evening1,11176.2%14.9%0.7%
Night11258.9%24.1%2.7%

Which weekday was most reliable for SJC to SEA?

Among qualifying SJC-to-SEA weekday results, Wednesday had the highest on-time rate: 88.1% of 615 flights. Friday was lowest at 78.4% across 648 flights.

DayFlightsOn time30+ minCancelled
Monday67481.6%10.8%0.7%
Tuesday63786.8%7.1%0.5%
Wednesday61588.1%6.2%0.8%
Thursday66379.0%11.3%0.9%
Friday64878.4%12.3%1.7%
Saturday50586.7%8.1%0.2%
Sunday62679.1%11.7%0.5%

Which airline was most reliable for SJC to SEA?

Among qualifying SJC-to-SEA airline results, SkyWest Airlines had the highest on-time rate: 89.3% of 1,563 flights. Southwest Airlines was lowest at 75.5% across 928 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines1,87480.6%10.2%1.7%
SkyWest Airlines1,56389.3%6.3%0.2%
Southwest Airlines92875.5%14.7%0.0%
American Airlines2100.0%0.0%0.0%
United Airlines1100.0%0.0%0.0%

Which month was most reliable for SJC to SEA?

Among qualifying SJC-to-SEA month results, February 2026 had the highest on-time rate: 92.9% of 339 flights. June 2026 was lowest at 76.6% across 401 flights.

MonthFlightsOn time30+ minCancelled
July 202542576.7%14.8%2.1%
August 202539580.0%11.6%0.8%
September 202536783.1%10.9%0.0%
October 202539283.7%7.7%1.3%
November 202537384.2%8.8%0.3%
December 202535478.5%12.4%1.1%
January 202633287.3%7.8%0.6%
February 202633992.9%4.4%0.0%
March 202632884.1%8.2%2.1%
April 202630686.3%8.2%0.3%
May 202635681.7%8.4%0.3%
June 202640176.6%11.5%0.2%

What drove SJC to SEA delay minutes?

Airline was the largest recorded SJC-to-SEA delay category, accounting for 35.2% of 37,287 BTS-attributed delay minutes during July 2025–June 2026.

Airline35.2%
Late aircraft33.3%
National airspace23.8%
Weather7.4%
Security0.2%
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.