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

Seattle, WA (SEA) to Portland, OR (PDX) flight delay odds

82.6% of 4,778 official scheduled SEA-to-PDX flights arrived on time; 8.8% arrived at least 30 minutes late and 0.7% 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
8.8%30+ min late
0.7%cancelled
4,778scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.7%all scheduled flights
120+ minutes late1.2%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+1.8 mincompleted flights

Which departure time was most reliable for SEA to PDX?

Among qualifying SEA-to-PDX departure window results, Early morning had the highest on-time rate: 91.4% of 734 flights. Night was lowest at 76.3% across 925 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning73491.4%4.6%0.3%
Late morning99283.9%8.7%0.8%
Afternoon1,20982.1%8.5%0.5%
Evening91880.9%10.7%1.0%
Night92576.3%10.9%0.8%

Which weekday was most reliable for SEA to PDX?

Among qualifying SEA-to-PDX weekday results, Tuesday had the highest on-time rate: 85.0% of 714 flights. Thursday was lowest at 79.0% across 691 flights.

DayFlightsOn time30+ minCancelled
Monday70382.6%9.7%0.4%
Tuesday71485.0%8.5%0.1%
Wednesday68784.7%6.4%0.4%
Thursday69179.0%11.0%0.4%
Friday69080.7%9.0%2.2%
Saturday61083.9%8.7%0.3%
Sunday68382.0%8.5%0.7%

Which airline was most reliable for SEA to PDX?

Among qualifying SEA-to-PDX airline results, SkyWest Airlines had the highest on-time rate: 85.6% of 3,343 flights. Alaska Airlines was lowest at 75.3% across 1,124 flights.

AirlineFlightsOn time30+ minCancelled
SkyWest Airlines3,34385.6%7.2%0.5%
Alaska Airlines1,12475.3%12.2%1.3%
Delta Air Lines31175.9%13.8%0.0%

Which month was most reliable for SEA to PDX?

Among qualifying SEA-to-PDX month results, April 2026 had the highest on-time rate: 90.4% of 374 flights. December 2025 was lowest at 73.3% across 378 flights.

MonthFlightsOn time30+ minCancelled
July 202539275.8%13.5%0.3%
August 202541681.7%8.4%0.0%
September 202543384.1%8.3%0.0%
October 202542887.4%4.2%0.7%
November 202540382.4%6.9%3.7%
December 202537873.3%15.1%0.5%
January 202640284.8%9.7%0.0%
February 202636187.0%5.8%0.0%
March 202639777.6%12.3%2.5%
April 202637490.4%4.5%0.3%
May 202639184.4%8.2%0.0%
June 202640381.9%9.2%0.0%

What drove SEA to PDX delay minutes?

Airline was the largest recorded SEA-to-PDX delay category, accounting for 50.5% of 40,415 BTS-attributed delay minutes during July 2025–June 2026.

Airline50.5%
Late aircraft24.6%
National airspace12.2%
Weather12.6%
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.