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

Houston, TX (IAH) to Philadelphia, PA (PHL) flight delay odds

Historically, 78.0% of scheduled reportable flights on this direction arrived on time in July 2025–June 2026. The sample includes 1,832 flights.

HISTORICAL ROUTE SIGNALGenerally reliable
78.0%arrived on time
13.5%30+ min late
2.1%cancelled
1,832scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.7%all scheduled flights
120+ minutes late4.6%all scheduled flights
Diverted0.1%did not reach as scheduled
Average arrival+15.7 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 morning70484.8%8.0%2.3%
Late morning10265.7%26.5%2.0%
Afternoon65775.5%14.2%2.3%
Evening36972.9%19.5%1.4%

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
Monday30073.7%17.0%3.0%
Tuesday23786.1%8.9%1.3%
Wednesday25779.8%12.8%0.4%
Thursday27980.3%10.8%1.4%
Friday28579.3%13.3%1.8%
Saturday20478.4%14.7%1.5%
Sunday27070.0%16.7%4.8%

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
United Airlines89182.2%11.6%1.0%
American Airlines71775.6%14.6%3.3%
PSA Airlines9268.5%15.2%2.2%
Frontier Airlines7071.4%21.4%1.4%
Spirit Airlines4271.4%14.3%4.8%
Republic Airways2060.0%25.0%0.0%

Monthly trend

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

MonthFlightsOn time30+ minCancelled
July 202515261.2%28.9%3.9%
August 202514371.3%18.9%3.5%
September 202513786.9%8.0%0.0%
October 202516177.6%11.2%0.0%
November 202515082.0%10.7%1.3%
December 202515784.1%8.9%1.9%
January 202614580.7%7.6%6.9%
February 202612787.4%5.5%3.9%
March 202614776.9%13.6%2.0%
April 202615986.8%6.9%0.6%
May 202616780.8%13.8%0.0%
June 202618764.7%24.6%1.6%

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.

Airline46.1%
Late aircraft37.9%
National airspace12.7%
Weather3.3%
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.