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

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

76.1% of 1,179 official scheduled SEA-to-MIA flights arrived on time; 13.0% 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
76.1%arrived on time
13.0%30+ min late
0.9%cancelled
1,179scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.2%all scheduled flights
120+ minutes late1.8%all scheduled flights
Diverted0.6%did not reach as scheduled
Average arrival+2.5 mincompleted flights

Which departure time was most reliable for SEA to MIA?

Among qualifying SEA-to-MIA departure window results, Early morning had the highest on-time rate: 77.3% of 728 flights. Evening was lowest at 73.8% across 164 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning72877.3%11.7%1.1%
Afternoon5874.1%17.2%0.0%
Evening16473.8%15.2%0.0%
Night22774.0%14.5%1.3%

Which weekday was most reliable for SEA to MIA?

Among qualifying SEA-to-MIA weekday results, Wednesday had the highest on-time rate: 81.1% of 164 flights. Friday was lowest at 67.5% across 169 flights.

DayFlightsOn time30+ minCancelled
Monday16873.2%15.5%1.8%
Tuesday17080.6%11.8%0.6%
Wednesday16481.1%7.3%1.2%
Thursday16881.0%11.3%0.0%
Friday16967.5%16.6%1.2%
Saturday17072.9%15.3%0.0%
Sunday17076.5%12.9%1.8%

Which airline was most reliable for SEA to MIA?

Among qualifying SEA-to-MIA airline results, Alaska Airlines had the highest on-time rate: 77.7% of 391 flights. American Airlines was lowest at 74.0% across 423 flights.

AirlineFlightsOn time30+ minCancelled
American Airlines42374.0%14.9%0.7%
Alaska Airlines39177.7%10.0%0.8%
Delta Air Lines36576.7%14.0%1.4%

Which month was most reliable for SEA to MIA?

Among qualifying SEA-to-MIA month results, October 2025 had the highest on-time rate: 89.2% of 93 flights. August 2025 was lowest at 63.4% across 93 flights.

MonthFlightsOn time30+ minCancelled
July 20259366.7%9.7%2.2%
August 20259363.4%22.6%1.1%
September 20259080.0%11.1%0.0%
October 20259389.2%3.2%1.1%
November 20259779.4%12.4%1.0%
December 202512076.7%12.5%0.8%
January 202610274.5%12.7%2.9%
February 20268481.0%10.7%0.0%
March 20269368.8%20.4%2.2%
April 20269073.3%16.7%0.0%
May 202610479.8%12.5%0.0%
June 202612079.2%11.7%0.0%

What drove SEA to MIA delay minutes?

Airline was the largest recorded SEA-to-MIA delay category, accounting for 43.1% of 13,804 BTS-attributed delay minutes during July 2025–June 2026.

Airline43.1%
Late aircraft22.4%
National airspace32.9%
Weather1.6%
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.