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

Houston, TX (IAH) to Miami, FL (MIA) flight delay odds

Historically, 76.7% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,736 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
76.7%arrived on time
14.6%30+ min late
1.2%cancelled
3,736scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.5%all scheduled flights
120+ minutes late4.0%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+10.6 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 morning1,15787.6%7.1%1.1%
Late morning59076.9%14.2%0.3%
Afternoon89875.1%15.7%0.9%
Evening1,06265.9%22.0%1.9%

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
Monday55079.3%13.3%2.2%
Tuesday48382.2%11.2%1.0%
Wednesday49580.0%12.5%0.6%
Thursday55377.9%13.7%0.9%
Friday54777.7%14.3%1.1%
Saturday54372.0%17.5%0.6%
Sunday56568.8%19.1%1.6%

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 Airlines1,52677.1%14.3%1.3%
United Airlines1,47979.7%12.2%0.4%
Spirit Airlines44168.5%20.2%3.2%
Frontier Airlines15467.5%22.1%1.9%
Envoy Air12277.9%15.6%0.0%
Republic Airways1464.3%35.7%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202531264.1%19.6%2.6%
August 202530070.7%20.7%0.7%
September 202527680.8%13.4%0.4%
October 202530483.6%9.9%0.3%
November 202533380.2%10.8%1.5%
December 202533982.0%11.2%0.3%
January 202634181.5%11.1%1.8%
February 202630980.6%12.3%1.3%
March 202634166.6%22.3%2.9%
April 202631079.4%13.5%1.0%
May 202629476.9%14.3%0.0%
June 202627774.0%16.6%0.7%

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.

Airline32.2%
Late aircraft41.6%
National airspace18.5%
Weather7.6%
Security0.1%
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.