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

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

Historically, 76.2% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 3,737 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
76.2%arrived on time
15.7%30+ min late
1.1%cancelled
3,737scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late9.2%all scheduled flights
120+ minutes late3.9%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+7.3 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 morning98389.8%5.8%0.3%
Late morning42486.1%7.1%0.7%
Afternoon1,34271.5%19.6%1.1%
Evening52163.5%24.6%1.7%
Night46766.4%23.3%2.6%

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
Monday55077.8%13.8%2.2%
Tuesday50180.0%13.2%1.2%
Wednesday47980.6%12.9%0.4%
Thursday55177.0%14.9%1.3%
Friday54877.4%15.0%0.4%
Saturday54273.8%18.3%1.1%
Sunday56668.0%21.2%1.2%

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 Airlines1,52769.2%20.4%1.2%
United Airlines1,47985.2%9.2%0.6%
Spirit Airlines44067.5%23.0%2.7%
Frontier Airlines15577.4%16.1%1.3%
Envoy Air12286.9%7.4%0.0%
Republic Airways1464.3%28.6%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202531166.6%25.4%2.3%
August 202530066.3%24.0%1.0%
September 202527680.8%14.5%0.0%
October 202530479.9%14.1%0.3%
November 202533278.0%13.3%1.5%
December 202534081.8%8.5%0.0%
January 202634282.7%9.6%2.3%
February 202631081.0%11.0%1.3%
March 202634167.2%22.6%2.6%
April 202631077.4%16.5%1.0%
May 202629473.8%16.0%0.7%
June 202627779.1%13.7%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.

Airline31.7%
Late aircraft34.2%
National airspace27.3%
Weather6.6%
Security0.3%
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.