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

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

85.3% of 3,820 official scheduled BOI-to-SEA flights arrived on time; 7.9% arrived at least 30 minutes late and 0.4% 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
85.3%arrived on time
7.9%30+ min late
0.4%cancelled
3,820scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.7%all scheduled flights
120+ minutes late1.2%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival-2.9 mincompleted flights

Which departure time was most reliable for BOI to SEA?

Among qualifying BOI-to-SEA departure window results, Early morning had the highest on-time rate: 92.0% of 1,294 flights. Evening was lowest at 78.2% across 808 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning1,29492.0%3.8%0.2%
Late morning75685.1%9.8%0.7%
Afternoon93683.2%8.2%0.5%
Evening80878.2%12.3%0.2%

Which weekday was most reliable for BOI to SEA?

Among qualifying BOI-to-SEA weekday results, Saturday had the highest on-time rate: 89.1% of 503 flights. Thursday was lowest at 79.7% across 556 flights.

DayFlightsOn time30+ minCancelled
Monday56487.2%7.3%0.4%
Tuesday55288.2%5.8%0.0%
Wednesday53984.8%8.0%0.2%
Thursday55679.7%10.8%0.4%
Friday55283.9%7.8%1.6%
Saturday50389.1%6.8%0.2%
Sunday55484.5%8.8%0.0%

Which airline was most reliable for BOI to SEA?

Among qualifying BOI-to-SEA airline results, SkyWest Airlines had the highest on-time rate: 85.9% of 2,929 flights. Alaska Airlines was lowest at 83.4% across 891 flights.

AirlineFlightsOn time30+ minCancelled
SkyWest Airlines2,92985.9%8.2%0.3%
Alaska Airlines89183.4%7.0%0.8%

Which month was most reliable for BOI to SEA?

Among qualifying BOI-to-SEA month results, February 2026 had the highest on-time rate: 92.8% of 293 flights. August 2025 was lowest at 81.7% across 349 flights.

MonthFlightsOn time30+ minCancelled
July 202536284.0%6.9%0.3%
August 202534981.7%11.5%0.0%
September 202533083.6%10.0%0.6%
October 202530184.7%8.3%0.3%
November 202525284.9%8.7%1.2%
December 202523886.6%6.3%0.0%
January 202629283.2%10.3%0.3%
February 202629392.8%3.8%0.0%
March 202636987.0%6.5%1.6%
April 202635689.0%7.0%0.3%
May 202636684.7%6.6%0.0%
June 202631281.7%9.0%0.0%

What drove BOI to SEA delay minutes?

Airline was the largest recorded BOI-to-SEA delay category, accounting for 52.5% of 30,399 BTS-attributed delay minutes during July 2025–June 2026.

Airline52.5%
Late aircraft13.7%
National airspace20.8%
Weather12.9%
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.