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Route Reliability

Boston → San Antonio

BOS–SAT · 1,764 miles · Boston Logan International Airport to San Antonio International Airport

80
Pretty Reliable
WanderNerd Reliability Score
81%
Arrive within 15 minutes
4 min
Average arrival delay
2.0%
Cancelled
355
Flights in the data

Data through May 2026.

Delta Air Lines is the only airline in this data on this route, arriving on time 81% of the time across 355 flights. No comparison to make.

What the data says

Mornings have a slight edge.

Departures between 6–9 AM arrived on time 85% of the time, against 81% between 9 AM–12 PM.

Sunday scaries are real for this one.

BOS–SAT flights arrived on time 87% of the time on Mondays and just 71% on Sundays. That gap is worth planning around.

Trending in the right direction.

BOS–SAT flights arrived on time 87% of the time over the last three months in the data, compared with 72% in the three months before that.

The breakdown

On-time by weekday
  • Mon87%(47 flights)
  • Tue79%(52 flights)
  • Wed80%(51 flights)
  • Thu83%(48 flights)
  • Fri84%(49 flights)
  • Sat86%(49 flights)
  • Sun71%(51 flights)
On-time by departure window
  • 6–9 AM85%(33 flights)
  • 9 AM–12 PM81%(312 flights)
  • 12–3 PM—(2 flights)
On-time trend by month
77%
May

Jun 76% → May 77% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202576%29
July 202590%29
August 202590%30
September 202583%30
October 202577%30
November 202582%27
December 202567%27
January 202679%28
February 202670%27
March 202697%31
April 202686%29
May 202677%30

Keep nerding

Based on 355 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.