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

67.9% of 719 official scheduled BWI-to-SEA flights arrived on time; 18.2% arrived at least 30 minutes late and 0.7% 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 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

Which departure time was most reliable for BWI to SEA?

Among qualifying BWI-to-SEA departure window results, Early morning had the highest on-time rate: 76.9% of 277 flights. Afternoon was lowest at 44.7% across 47 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning27776.9%15.2%0.7%
Afternoon4744.7%36.2%0.0%
Evening37764.2%18.3%0.8%

Which weekday was most reliable for BWI to SEA?

Among qualifying BWI-to-SEA weekday results, Sunday had the highest on-time rate: 73.6% of 106 flights. Thursday was lowest at 60.0% across 105 flights.

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%

Which airline was most reliable for BWI to SEA?

Among qualifying BWI-to-SEA airline results, Alaska Airlines had the highest on-time rate: 68.1% of 599 flights. Southwest Airlines was lowest at 66.7% across 120 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines59968.1%17.5%0.8%
Southwest Airlines12066.7%21.7%0.0%

Which month was most reliable for BWI to SEA?

Among qualifying BWI-to-SEA month results, October 2025 had the highest on-time rate: 87.5% of 56 flights. December 2025 was lowest at 31.7% across 60 flights.

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 BWI to SEA delay minutes?

National airspace was the largest recorded BWI-to-SEA delay category, accounting for 35.4% of 11,815 BTS-attributed delay minutes during July 2025–June 2026.

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.