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

Seattle, WA (SEA) to Boise, ID (BOI) flight delay odds

85.5% of 3,972 official scheduled SEA-to-BOI flights arrived on time; 7.5% arrived at least 30 minutes late and 0.3% 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
85.5%arrived on time
7.5%30+ min late
0.3%cancelled
3,972scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.6%all scheduled flights
120+ minutes late1.0%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival-1.6 mincompleted flights

Which departure time was most reliable for SEA to BOI?

Among qualifying SEA-to-BOI departure window results, Early morning had the highest on-time rate: 91.9% of 627 flights. Evening was lowest at 82.4% across 1,105 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning62791.9%4.0%0.2%
Late morning65386.7%6.7%0.3%
Afternoon1,20585.4%7.1%0.1%
Evening1,10582.4%9.5%0.5%
Night38282.5%9.9%0.3%

Which weekday was most reliable for SEA to BOI?

Among qualifying SEA-to-BOI weekday results, Saturday had the highest on-time rate: 89.5% of 535 flights. Sunday was lowest at 82.1% across 575 flights.

DayFlightsOn time30+ minCancelled
Monday58585.8%7.2%0.0%
Tuesday57388.1%6.3%0.0%
Wednesday55287.1%5.8%0.0%
Thursday57883.6%9.2%0.2%
Friday57482.8%8.5%1.0%
Saturday53589.5%5.0%0.2%
Sunday57582.1%10.1%0.3%

Which airline was most reliable for SEA to BOI?

Among qualifying SEA-to-BOI airline results, SkyWest Airlines had the highest on-time rate: 87.0% of 3,081 flights. Alaska Airlines was lowest at 80.5% across 891 flights.

AirlineFlightsOn time30+ minCancelled
SkyWest Airlines3,08187.0%7.0%0.2%
Alaska Airlines89180.5%9.1%0.4%

Which month was most reliable for SEA to BOI?

Among qualifying SEA-to-BOI month results, October 2025 had the highest on-time rate: 91.6% of 333 flights. July 2025 was lowest at 79.7% across 394 flights.

MonthFlightsOn time30+ minCancelled
July 202539479.7%10.7%0.3%
August 202537080.0%7.8%0.0%
September 202533486.2%5.4%0.0%
October 202533391.6%5.4%0.0%
November 202528285.5%5.7%1.1%
December 202526685.3%6.8%0.0%
January 202630086.7%8.3%0.3%
February 202629486.7%7.8%0.0%
March 202636983.5%11.4%1.4%
April 202635589.3%5.6%0.0%
May 202636387.9%6.6%0.0%
June 202631285.6%7.1%0.0%

What drove SEA to BOI delay minutes?

Airline was the largest recorded SEA-to-BOI delay category, accounting for 49.8% of 27,707 BTS-attributed delay minutes during July 2025–June 2026.

Airline49.8%
Late aircraft22.1%
National airspace12.6%
Weather15.3%
Security0.2%
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.