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

Boise, ID (BOI) to Chicago, IL (ORD) flight delay odds

Historically, 74.1% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,111 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
74.1%arrived on time
15.8%30+ min late
1.0%cancelled
1,111scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.5%all scheduled flights
120+ minutes late4.7%all scheduled flights
Diverted0.6%did not reach as scheduled
Average arrival+12.5 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 morning38483.1%7.6%1.8%
Afternoon72569.2%20.1%0.6%

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
Monday15972.3%18.9%0.6%
Tuesday16280.9%12.3%0.6%
Wednesday15770.7%15.9%0.6%
Thursday15878.5%10.8%1.3%
Friday15765.6%21.0%0.0%
Saturday15879.1%10.8%1.9%
Sunday16071.2%20.6%1.9%

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 Airlines50781.5%9.5%1.8%
United Airlines24475.8%14.8%0.8%
Envoy Air18863.8%28.7%0.0%
American Airlines17261.0%21.5%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 20259371.0%18.3%0.0%
August 20259367.7%15.1%0.0%
September 20259172.5%13.2%0.0%
October 20259284.8%7.6%0.0%
November 20258865.9%26.1%3.4%
December 202510471.2%20.2%1.0%
January 20269878.6%14.3%1.0%
February 20268490.5%3.6%0.0%
March 20269372.0%19.4%4.3%
April 20269164.8%20.9%1.1%
May 20269378.5%9.7%0.0%
June 20269172.5%19.8%1.1%

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.

Airline26.1%
Late aircraft33.6%
National airspace24.5%
Weather15.8%
Security0.0%
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.