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

Washington, DC (IAD) to Miami, FL (MIA) flight delay odds

Historically, 80.3% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 646 flights.

HISTORICAL ROUTE SIGNALLower disruption
80.3%arrived on time
11.5%30+ min late
1.1%cancelled
646scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late5.6%all scheduled flights
120+ minutes late2.9%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+2.2 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 morning30986.4%6.8%0.6%
Late morning5581.8%14.5%0.0%
Afternoon20779.7%11.6%1.0%
Evening4456.8%31.8%0.0%

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
Monday10879.6%11.1%1.9%
Tuesday7286.1%9.7%0.0%
Wednesday7291.7%1.4%0.0%
Thursday9872.4%18.4%1.0%
Friday10681.1%12.3%0.0%
Saturday8984.3%11.2%0.0%
Sunday10172.3%12.9%4.0%

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
United Airlines51285.0%8.6%0.6%
Frontier Airlines13462.7%22.4%3.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 20255261.5%21.2%3.8%
August 20255375.5%20.8%0.0%
September 20254793.6%2.1%0.0%
October 20254987.8%2.0%0.0%
November 20254475.0%22.7%0.0%
December 20255881.0%10.3%0.0%
January 20267669.7%13.2%5.3%
February 20266182.0%8.2%0.0%
March 20266379.4%17.5%0.0%
April 20266882.4%10.3%1.5%
May 20264593.3%0.0%0.0%
June 20263096.7%3.3%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.

Airline23.7%
Late aircraft36.6%
National airspace38.5%
Weather1.2%
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.