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

Washington, DC (IAD) to San Antonio, TX (SAT) flight delay odds

85.0% of 641 official scheduled IAD-to-SAT flights arrived on time; 9.4% arrived at least 30 minutes late and 0.6% were cancelled during July 2025–June 2026.

Source: U.S. Bureau of Transportation Statistics · Reporting window: July 2025–June 2026 · Updated September 16, 2026

HISTORICAL ROUTE SIGNALLower disruption
85.0%arrived on time
9.4%30+ min late
0.6%cancelled
641scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late6.6%all scheduled flights
120+ minutes late3.7%all scheduled flights
Diverted0.0%did not reach as scheduled
Average arrival+0.2 mincompleted flights

Which departure time was most reliable for IAD to SAT?

Among qualifying IAD-to-SAT departure window results, Early morning had the highest on-time rate: 93.6% of 280 flights. Evening was lowest at 78.4% across 361 flights.

Departure windowFlightsOn time30+ minCancelled
Early morning28093.6%3.6%0.7%
Evening36178.4%13.9%0.6%

Which weekday was most reliable for IAD to SAT?

Among qualifying IAD-to-SAT weekday results, Tuesday had the highest on-time rate: 92.0% of 87 flights. Sunday was lowest at 77.6% across 98 flights.

DayFlightsOn time30+ minCancelled
Monday10489.4%5.8%0.0%
Tuesday8792.0%4.6%0.0%
Wednesday8085.0%10.0%0.0%
Thursday10486.5%8.7%1.0%
Friday10483.7%12.5%0.0%
Saturday6479.7%12.5%1.6%
Sunday9877.6%12.2%2.0%

Which airline was most reliable for IAD to SAT?

Only United Airlines met the IAD-to-SAT airline threshold: 85.0% of 641 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
United Airlines64185.0%9.4%0.6%

Which month was most reliable for IAD to SAT?

Among qualifying IAD-to-SAT month results, October 2025 had the highest on-time rate: 98.2% of 55 flights. July 2025 was lowest at 69.0% across 58 flights.

MonthFlightsOn time30+ minCancelled
July 20255869.0%22.4%0.0%
August 20255190.2%5.9%0.0%
September 20255190.2%3.9%0.0%
October 20255598.2%1.8%0.0%
November 20256085.0%11.7%0.0%
December 20255879.3%10.3%0.0%
January 20264879.2%4.2%6.2%
February 20264691.3%6.5%0.0%
March 20265787.7%10.5%0.0%
April 20265186.3%5.9%2.0%
May 20265088.0%6.0%0.0%
June 20265678.6%19.6%0.0%

What drove IAD to SAT delay minutes?

Airline was the largest recorded IAD-to-SAT delay category, accounting for 34.6% of 8,460 BTS-attributed delay minutes during July 2025–June 2026.

Airline34.6%
Late aircraft30.7%
National airspace18.0%
Weather16.7%
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.