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

Seattle, WA (SEA) to San Antonio, TX (SAT) flight delay odds

75.4% of 558 official scheduled SEA-to-SAT flights arrived on time; 12.2% arrived at least 30 minutes late and 1.1% 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
75.4%arrived on time
12.2%30+ min late
1.1%cancelled
558scheduled flights
Based on July 2025–June 2026; on time means arrival less than 15 minutes late.
60+ minutes late3.6%all scheduled flights
120+ minutes late1.4%all scheduled flights
Diverted0.2%did not reach as scheduled
Average arrival+3.0 mincompleted flights

Which departure time was most reliable for SEA to SAT?

Among qualifying SEA-to-SAT departure window results, Evening had the highest on-time rate: 80.3% of 66 flights. Afternoon was lowest at 68.9% across 122 flights.

Departure windowFlightsOn time30+ minCancelled
Late morning24377.4%11.5%0.8%
Afternoon12268.9%16.4%0.8%
Evening6680.3%9.1%1.5%
Night12775.6%11.0%1.6%

Which weekday was most reliable for SEA to SAT?

Among qualifying SEA-to-SAT weekday results, Tuesday had the highest on-time rate: 82.9% of 76 flights. Sunday was lowest at 66.3% across 86 flights.

DayFlightsOn time30+ minCancelled
Monday8675.6%14.0%2.3%
Tuesday7682.9%6.6%0.0%
Wednesday7080.0%8.6%0.0%
Thursday8576.5%10.6%2.4%
Friday8475.0%13.1%1.2%
Saturday7173.2%16.9%0.0%
Sunday8666.3%15.1%1.2%

Which airline was most reliable for SEA to SAT?

Only Alaska Airlines met the SEA-to-SAT airline threshold: 75.4% of 558 scheduled flights arrived on time during July 2025–June 2026.

AirlineFlightsOn time30+ minCancelled
Alaska Airlines55875.4%12.2%1.1%

Which month was most reliable for SEA to SAT?

Among qualifying SEA-to-SAT month results, September 2025 had the highest on-time rate: 93.6% of 47 flights. July 2025 was lowest at 59.0% across 61 flights.

MonthFlightsOn time30+ minCancelled
July 20256159.0%14.8%1.6%
August 20255766.7%21.1%1.8%
September 20254793.6%0.0%0.0%
October 20255479.6%13.0%3.7%
November 20255074.0%10.0%4.0%
December 20255269.2%21.2%0.0%
January 20263767.6%16.2%0.0%
February 20262889.3%0.0%0.0%
March 20263174.2%9.7%0.0%
April 20263086.7%3.3%0.0%
May 20265188.2%3.9%0.0%
June 20266071.7%20.0%0.0%

What drove SEA to SAT delay minutes?

Late aircraft was the largest recorded SEA-to-SAT delay category, accounting for 45.4% of 5,525 BTS-attributed delay minutes during July 2025–June 2026.

Airline41.8%
Late aircraft45.4%
National airspace12.4%
Weather0.3%
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.