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

Boston, MA (BOS) to San Antonio, TX (SAT) flight delay odds

78.0% of 355 official scheduled BOS-to-SAT flights arrived on time; 13.0% arrived at least 30 minutes late and 2.3% 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 SIGNALGenerally reliable
78.0%arrived on time
13.0%30+ min late
2.3%cancelled
355scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late8.2%all scheduled flights
120+ minutes late4.2%all scheduled flights
Diverted0.3%did not reach as scheduled
Average arrival+3.5 mincompleted flights

Which departure time was most reliable for BOS to SAT?

Only Late morning met the BOS-to-SAT departure window threshold: 77.1% of 314 scheduled flights arrived on time during July 2025–June 2026.

Departure windowFlightsOn time30+ minCancelled
Late morning31477.1%14.3%2.2%

Which weekday was most reliable for BOS to SAT?

Among qualifying BOS-to-SAT weekday results, Wednesday had the highest on-time rate: 82.7% of 52 flights. Sunday was lowest at 72.5% across 51 flights.

DayFlightsOn time30+ minCancelled
Monday5276.9%13.5%9.6%
Tuesday5377.4%17.0%0.0%
Wednesday5282.7%7.7%1.9%
Thursday4977.6%6.1%2.0%
Friday4977.6%18.4%2.0%
Saturday4981.6%10.2%0.0%
Sunday5172.5%17.6%0.0%

Which airline was most reliable for BOS to SAT?

Only Delta Air Lines met the BOS-to-SAT airline threshold: 78.0% of 355 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Delta Air Lines35578.0%13.0%2.3%

Which month was most reliable for BOS to SAT?

Among qualifying BOS-to-SAT month results, March 2026 had the highest on-time rate: 96.8% of 31 flights. June 2026 was lowest at 63.3% across 30 flights.

MonthFlightsOn time30+ minCancelled
July 20253086.7%10.0%0.0%
August 20253090.0%10.0%0.0%
September 20253083.3%10.0%0.0%
October 20253076.7%16.7%0.0%
November 20252875.0%14.3%3.6%
December 20252864.3%25.0%3.6%
January 20262975.9%17.2%3.4%
February 20262867.9%10.7%3.6%
March 20263196.8%3.2%0.0%
April 20263080.0%10.0%3.3%
May 20263174.2%9.7%3.2%
June 20263063.3%20.0%6.7%

What drove BOS to SAT delay minutes?

Airline was the largest recorded BOS-to-SAT delay category, accounting for 55.9% of 5,529 BTS-attributed delay minutes during July 2025–June 2026.

Airline55.9%
Late aircraft28.3%
National airspace15.2%
Weather0.5%
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.