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

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

80.5% of 3,035 official scheduled BOI-to-DEN flights arrived on time; 12.2% arrived at least 30 minutes late and 0.2% 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 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

Which departure time was most reliable for BOI to DEN?

Among qualifying BOI-to-DEN departure window results, Early morning had the highest on-time rate: 92.0% of 1,046 flights. Evening was lowest at 64.4% across 435 flights.

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%

Which weekday was most reliable for BOI to DEN?

Among qualifying BOI-to-DEN weekday results, Saturday had the highest on-time rate: 85.4% of 405 flights. Friday was lowest at 72.1% across 433 flights.

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%

Which airline was most reliable for BOI to DEN?

Among qualifying BOI-to-DEN airline results, SkyWest Airlines had the highest on-time rate: 85.8% of 871 flights. Southwest Airlines was lowest at 77.3% across 1,092 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%

Which month was most reliable for BOI to DEN?

Among qualifying BOI-to-DEN month results, January 2026 had the highest on-time rate: 90.2% of 255 flights. July 2025 was lowest at 69.0% across 261 flights.

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 BOI to DEN delay minutes?

National airspace was the largest recorded BOI-to-DEN delay category, accounting for 34.7% of 44,187 BTS-attributed delay minutes during July 2025–June 2026.

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.