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

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

Historically, 76.1% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,179 flights.

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

When is this route most reliable?

The same route can behave differently through the day. These are scheduled departure windows, not actual departure times. Small time windows with fewer than 40 flights are withheld.

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%

Weekday comparison

Day-of-week results use at least 30 scheduled flights per row. Look for broad patterns, not tiny percentage differences.

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%

Airline comparison

Marketing-carrier results make codeshare flights easier to compare as travelers buy them. Dedicated route-airline reports require at least 160 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%

Monthly trend

Month-by-month results show whether a twelve-month average hides an unusual period.

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 reported delay minutes?

BTS cause minutes are reported for qualifying delayed flights. These shares describe recorded delay minutes—not the chance that a particular cause will affect your next flight.

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.