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

Miami, FL (MIA) to Seattle, WA (SEA) flight delay odds

64.7% of 1,180 official scheduled MIA-to-SEA flights arrived on time; 21.9% arrived at least 30 minutes late and 1.2% 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
64.7%arrived on time
21.9%30+ min late
1.2%cancelled
1,180scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late10.6%all scheduled flights
120+ minutes late3.7%all scheduled flights
Diverted0.4%did not reach as scheduled
Average arrival+16.5 mincompleted flights

Which departure time was most reliable for MIA to SEA?

Among qualifying MIA-to-SEA departure window results, Early morning had the highest on-time rate: 80.4% of 112 flights. Evening was lowest at 63.0% across 1,064 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning11280.4%10.7%0.0%
Evening1,06463.0%23.1%1.3%

Which weekday was most reliable for MIA to SEA?

Among qualifying MIA-to-SEA weekday results, Tuesday had the highest on-time rate: 72.9% of 170 flights. Sunday was lowest at 58.8% across 170 flights.

DayFlightsOn time30+ minCancelled
Monday17063.5%22.4%2.4%
Tuesday17072.9%15.3%1.2%
Wednesday16470.7%14.0%1.2%
Thursday16861.9%17.9%0.6%
Friday16858.9%28.6%1.8%
Saturday17065.9%24.7%0.0%
Sunday17058.8%30.6%1.2%

Which airline was most reliable for MIA to SEA?

Among qualifying MIA-to-SEA airline results, American Airlines had the highest on-time rate: 69.0% of 423 flights. Delta Air Lines was lowest at 60.3% across 365 flights.

AirlineFlightsOn time30+ minCancelled
American Airlines42369.0%19.6%0.5%
Alaska Airlines39264.0%19.9%1.5%
Delta Air Lines36560.3%26.8%1.6%

Which month was most reliable for MIA to SEA?

Among qualifying MIA-to-SEA month results, June 2026 had the highest on-time rate: 81.7% of 120 flights. March 2026 was lowest at 44.1% across 93 flights.

MonthFlightsOn time30+ minCancelled
July 20259363.4%22.6%2.2%
August 20259351.6%32.3%1.1%
September 20259064.4%25.6%0.0%
October 20259377.4%12.9%1.1%
November 20259667.7%17.7%2.1%
December 202512165.3%18.2%0.8%
January 202610361.2%25.2%1.9%
February 20268469.0%21.4%0.0%
March 20269344.1%34.4%3.2%
April 20269060.0%23.3%1.1%
May 202610465.4%22.1%1.0%
June 202612081.7%11.7%0.0%

What drove MIA to SEA delay minutes?

Airline was the largest recorded MIA-to-SEA delay category, accounting for 45.0% of 26,536 BTS-attributed delay minutes during July 2025–June 2026.

Airline45.0%
Late aircraft30.7%
National airspace19.3%
Weather3.8%
Security1.2%
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.