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

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

Historically, 67.3% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 5,572 flights.

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

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 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%

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
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%

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
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%

Monthly trend

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

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 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.

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.