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

Chicago, IL (ORD) to Seattle, WA (SEA) flight delay odds

67.3% of 5,572 official scheduled ORD-to-SEA flights arrived on time; 19.0% arrived at least 30 minutes late and 1.5% 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 SIGNALVariable
67.3%arrived on time
19.0%30+ min late
1.5%cancelled
5,572scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.4%all scheduled flights
120+ minutes late3.4%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+14.2 mincompleted flights

Which departure time was most reliable for ORD to SEA?

Among qualifying ORD-to-SEA departure window results, Early morning had the highest on-time rate: 77.7% of 1,665 flights. Night was lowest at 49.0% across 263 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,66577.7%10.8%0.7%
Late morning81068.5%18.3%1.0%
Afternoon1,42871.6%16.8%0.6%
Evening1,40653.3%28.5%2.9%
Night26349.0%34.6%4.2%

Which weekday was most reliable for ORD to SEA?

Among qualifying ORD-to-SEA weekday results, Tuesday had the highest on-time rate: 71.2% of 805 flights. Sunday was lowest at 63.8% across 816 flights.

DayFlightsOn time30+ minCancelled
Monday83066.5%19.3%1.4%
Tuesday80571.2%14.7%1.2%
Wednesday77769.1%18.8%1.0%
Thursday82166.6%18.5%1.9%
Friday81965.0%20.8%1.1%
Saturday70469.3%18.2%1.1%
Sunday81663.8%22.7%2.2%

Which airline was most reliable for ORD to SEA?

Among qualifying ORD-to-SEA airline results, United Airlines had the highest on-time rate: 73.0% of 1,535 flights. American Airlines was lowest at 62.2% across 1,336 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines1,79966.2%19.9%1.7%
United Airlines1,53573.0%14.5%0.7%
American Airlines1,33662.2%23.9%2.0%
Delta Air Lines90267.4%17.7%1.4%

Which month was most reliable for ORD to SEA?

Among qualifying ORD-to-SEA month results, September 2025 had the highest on-time rate: 83.7% of 509 flights. December 2025 was lowest at 46.6% across 384 flights.

MonthFlightsOn time30+ minCancelled
July 202562265.6%21.9%1.3%
August 202560267.1%20.1%2.0%
September 202550983.7%10.2%0.4%
October 202549673.8%12.9%0.6%
November 202539159.3%22.0%3.8%
December 202538446.6%29.7%2.1%
January 202630164.5%24.3%1.7%
February 202630173.1%12.6%0.3%
March 202635749.3%30.0%2.8%
April 202646574.6%14.6%1.3%
May 202656273.1%14.9%0.0%
June 202658266.5%19.9%1.9%

What drove ORD to SEA delay minutes?

Late aircraft was the largest recorded ORD-to-SEA delay category, accounting for 40.7% of 111,212 BTS-attributed delay minutes during July 2025–June 2026.

Airline28.4%
Late aircraft40.7%
National airspace24.1%
Weather6.7%
Security0.1%
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.