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

Boise, ID (BOI) to Denver, CO (DEN) flight delay odds

Historically, 80.5% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,035 flights.

HISTORICAL ROUTE SIGNALLower disruption
80.5%arrived on time
12.2%30+ min late
0.2%cancelled
3,035scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.7%all scheduled flights
120+ minutes late3.0%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+6.6 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 morning1,04692.0%4.7%0.3%
Late morning68687.6%8.2%0.1%
Afternoon86869.1%18.5%0.2%
Evening43564.4%24.1%0.0%

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
Monday42380.9%12.1%0.2%
Tuesday43083.5%10.2%0.2%
Wednesday41583.9%10.4%0.0%
Thursday45577.4%14.3%0.2%
Friday43372.1%17.6%0.5%
Saturday40585.4%8.6%0.2%
Sunday47481.0%12.0%0.0%

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
Southwest Airlines1,09277.3%12.8%0.1%
United Airlines94679.4%13.2%0.5%
SkyWest Airlines87185.8%10.3%0.0%
Frontier Airlines12680.2%12.7%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202526169.0%21.8%1.1%
August 202525971.8%18.9%0.4%
September 202525080.8%10.8%0.0%
October 202525981.5%6.2%0.0%
November 202524584.5%7.8%0.0%
December 202525885.3%11.2%0.0%
January 202625590.2%5.5%0.0%
February 202623382.8%12.4%0.0%
March 202625385.4%10.3%0.4%
April 202624882.7%12.1%0.0%
May 202626178.9%14.2%0.4%
June 202625373.9%15.0%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.

Airline34.6%
Late aircraft26.9%
National airspace34.7%
Weather3.8%
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.