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

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

Historically, 82.6% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 4,778 flights.

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

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

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%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

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%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 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%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

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 reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

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.