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

Boise, ID (BOI) to Portland, OR (PDX) flight delay odds

Historically, 91.4% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,115 flights.

HISTORICAL ROUTE SIGNALLower disruption
91.4%arrived on time
4.4%30+ min late
0.5%cancelled
1,115scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late2.3%all scheduled flights
120+ minutes late0.8%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival-3.6 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 morning28595.4%2.8%0.4%
Late morning21694.9%3.2%0.0%
Afternoon57387.4%5.9%0.9%
Evening41100.0%0.0%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
Monday16895.2%4.2%0.0%
Tuesday15595.5%1.9%0.6%
Wednesday15491.6%3.2%0.0%
Thursday16989.9%4.7%0.6%
Friday16886.3%6.5%0.6%
Saturday13590.4%3.7%2.2%
Sunday16691.0%6.0%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
Alaska Airlines65891.5%4.6%0.2%
SkyWest Airlines45791.2%4.2%1.1%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 20258993.3%3.4%0.0%
August 202510290.2%3.9%0.0%
September 202512095.0%4.2%0.0%
October 202511995.8%2.5%0.8%
November 202510887.0%4.6%3.7%
December 202510584.8%6.7%0.0%
January 202610393.2%3.9%0.0%
February 20269594.7%4.2%0.0%
March 20268489.3%8.3%0.0%
April 20265794.7%1.8%0.0%
May 20267685.5%3.9%1.3%
June 20265793.0%5.3%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.

Airline30.7%
Late aircraft57.4%
National airspace9.0%
Weather2.9%
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.