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Route Reliability

San Antonio → Baltimore

SAT–BWI · 1,407 miles · San Antonio International Airport to Baltimore/Washington International Thurgood Marshall Airport

83
Pretty Reliable
WanderNerd Reliability Score
83%
Arrive within 15 minutes
4 min
Average arrival delay
1.9%
Cancelled
748
Flights in the data

Data through May 2026.

Airlines on this route

  • Southwest Airlines83% on time · 738 flights
  • Spirit Airlines44% on time · 10 flights

Too little history on this route to call a winner. We rank airlines only after 100 flights each.

What the data says

The 12–3 PM departure wins.

SAT–BWI flights departing between 12–3 PM arrived on time 96% of the time, versus 66% between 3–6 PM.

Skip Thursday if you can.

SAT–BWI flights arrived on time 89% of the time on Mondays. On Thursdays: 76%.

Recent months have been rougher.

SAT–BWI flights arrived on time 76% of the time over the last three months in the data, compared with 90% in the three months before that.

Flights on this route

The breakdown

On-time by weekday
  • Mon89%(123 flights)
  • Tue85%(106 flights)
  • Wed83%(102 flights)
  • Thu76%(118 flights)
  • Fri80%(122 flights)
  • Sat84%(75 flights)
  • Sun81%(87 flights)
On-time by departure window
  • 3–6 AM94%(342 flights)
  • 6–9 AM—(1 flights)
  • 9 AM–12 PM83%(95 flights)
  • 12–3 PM96%(26 flights)
  • 3–6 PM66%(263 flights)
  • 6–9 PM—(6 flights)
On-time trend by month
85%
May

Jun 78% → May 85% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202578%85
July 202574%83
August 202588%69
September 202590%69
October 202585%74
November 202582%61
December 202591%70
January 202695%37
February 202684%32
March 202658%50
April 202684%51
May 202685%52

Same trip, other airports

Keep nerding

Based on 748 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.