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

Baltimore, MD (BWI) to Seattle, WA (SEA) flight delay odds

Historically, 67.9% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 719 flights.

HISTORICAL ROUTE SIGNALVariable
67.9%arrived on time
18.2%30+ min late
0.7%cancelled
719scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late7.0%all scheduled flights
120+ minutes late2.6%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+10.5 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 morning27776.9%15.2%0.7%
Afternoon4744.7%36.2%0.0%
Evening37764.2%18.3%0.8%

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
Monday10668.9%20.8%1.9%
Tuesday10368.9%15.5%0.0%
Wednesday10168.3%21.8%0.0%
Thursday10560.0%24.8%0.0%
Friday10465.4%16.3%1.0%
Saturday9470.2%13.8%0.0%
Sunday10673.6%14.2%1.9%

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 Airlines59968.1%17.5%0.8%
Southwest Airlines12066.7%21.7%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 20259252.2%29.3%0.0%
August 20259380.6%10.8%1.1%
September 20259085.6%8.9%0.0%
October 20255687.5%5.4%1.8%
November 20255078.0%2.0%0.0%
December 20256031.7%41.7%1.7%
January 20263762.2%24.3%5.4%
February 20262875.0%14.3%0.0%
March 20263138.7%41.9%0.0%
April 20263770.3%13.5%0.0%
May 20265874.1%10.3%0.0%
June 20268764.4%23.0%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.

Airline16.8%
Late aircraft32.8%
National airspace35.4%
Weather12.8%
Security2.3%
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.