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

Washington, DC (DCA) to Seattle, WA (SEA) flight delay odds

71.7% of 1,094 official scheduled DCA-to-SEA flights arrived on time; 16.9% arrived at least 30 minutes late and 1.7% 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 SIGNALGenerally reliable
71.7%arrived on time
16.9%30+ min late
1.7%cancelled
1,094scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.4%all scheduled flights
120+ minutes late3.8%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+9.3 mincompleted flights

Which departure time was most reliable for DCA to SEA?

Among qualifying DCA-to-SEA departure window results, Early morning had the highest on-time rate: 78.9% of 365 flights. Afternoon was lowest at 64.0% across 364 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning36578.9%11.0%1.1%
Afternoon36464.0%22.8%3.0%
Evening36572.1%17.0%1.1%

Which weekday was most reliable for DCA to SEA?

Among qualifying DCA-to-SEA weekday results, Saturday had the highest on-time rate: 82.7% of 156 flights. Thursday was lowest at 67.1% across 155 flights.

DayFlightsOn time30+ minCancelled
Monday15670.5%17.3%3.2%
Tuesday15973.0%18.2%0.6%
Wednesday15667.9%18.6%0.6%
Thursday15567.1%21.3%1.9%
Friday15673.1%11.5%0.6%
Saturday15682.7%10.3%1.3%
Sunday15667.3%21.2%3.8%

Which airline was most reliable for DCA to SEA?

Among qualifying DCA-to-SEA airline results, Alaska Airlines had the highest on-time rate: 75.4% of 729 flights. Delta Air Lines was lowest at 64.1% across 365 flights.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines72975.4%14.0%1.1%
Delta Air Lines36564.1%22.7%3.0%

Which month was most reliable for DCA to SEA?

Among qualifying DCA-to-SEA month results, April 2026 had the highest on-time rate: 85.6% of 90 flights. December 2025 was lowest at 44.1% across 93 flights.

MonthFlightsOn time30+ minCancelled
July 20259355.9%31.2%4.3%
August 20259383.9%11.8%2.2%
September 20259083.3%15.6%0.0%
October 20259380.6%14.0%0.0%
November 20258973.0%11.2%0.0%
December 20259344.1%31.2%2.2%
January 20269375.3%8.6%5.4%
February 20268464.3%19.0%1.2%
March 20269352.7%29.0%4.3%
April 20269085.6%7.8%0.0%
May 20269383.9%8.6%0.0%
June 20269077.8%14.4%1.1%

What drove DCA to SEA delay minutes?

National airspace was the largest recorded DCA-to-SEA delay category, accounting for 34.1% of 20,062 BTS-attributed delay minutes during July 2025–June 2026.

Airline28.6%
Late aircraft29.2%
National airspace34.1%
Weather8.1%
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.