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

Detroit, MI (DTW) to Seattle, WA (SEA) flight delay odds

72.4% of 2,076 official scheduled DTW-to-SEA flights arrived on time; 16.0% arrived at least 30 minutes late and 0.9% 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
72.4%arrived on time
16.0%30+ min late
0.9%cancelled
2,076scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.0%all scheduled flights
120+ minutes late1.9%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+7.7 mincompleted flights

Which departure time was most reliable for DTW to SEA?

Among qualifying DTW-to-SEA departure window results, Early morning had the highest on-time rate: 78.7% of 595 flights. Evening was lowest at 67.3% across 587 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning59578.7%11.4%1.2%
Afternoon85971.7%14.9%0.8%
Evening58767.3%22.1%0.7%

Which weekday was most reliable for DTW to SEA?

Among qualifying DTW-to-SEA weekday results, Tuesday had the highest on-time rate: 77.9% of 303 flights. Sunday was lowest at 67.4% across 304 flights.

DayFlightsOn time30+ minCancelled
Monday30370.3%16.2%2.0%
Tuesday30377.9%11.6%0.7%
Wednesday29573.9%16.9%0.0%
Thursday30075.3%13.7%0.0%
Friday30467.8%17.1%1.0%
Saturday26774.5%15.7%1.5%
Sunday30467.4%21.1%1.0%

Which airline was most reliable for DTW to SEA?

Among qualifying DTW-to-SEA airline results, Alaska Airlines had the highest on-time rate: 74.5% of 541 flights. Delta Air Lines was lowest at 71.7% across 1,535 flights.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines1,53571.7%16.4%1.0%
Alaska Airlines54174.5%15.2%0.4%

Which month was most reliable for DTW to SEA?

Among qualifying DTW-to-SEA month results, September 2025 had the highest on-time rate: 89.8% of 176 flights. December 2025 was lowest at 37.2% across 164 flights.

MonthFlightsOn time30+ minCancelled
July 202522874.6%14.5%2.2%
August 202521482.7%8.4%0.9%
September 202517689.8%5.1%0.0%
October 202515986.8%6.3%0.0%
November 202515472.1%15.6%0.0%
December 202516437.2%43.9%1.2%
January 202613567.4%17.0%1.5%
February 202612569.6%17.6%0.8%
March 202615145.0%30.5%3.3%
April 202615581.9%11.0%0.0%
May 202620675.2%14.1%0.5%
June 202620976.6%14.4%0.0%

What drove DTW to SEA delay minutes?

Airline was the largest recorded DTW-to-SEA delay category, accounting for 43.6% of 29,497 BTS-attributed delay minutes during July 2025–June 2026.

Airline43.6%
Late aircraft23.9%
National airspace29.4%
Weather2.9%
Security0.2%
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.