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Route Reliability

Washington → San Antonio

IAD–SAT · 1,362 miles · Washington Dulles International Airport to San Antonio International Airport

92
Nerd Approved
WanderNerd Reliability Score
86%
Arrive within 15 minutes
2 min early
Average arrival delay
0.6%
Cancelled
678
Flights in the data

Data through May 2026.

United Airlines is the only airline in this data on this route, arriving on time 86% of the time across 678 flights. No comparison to make.

What the data says

Morning-you made the right choice.

IAD–SAT flights departing between 6–9 AM arrived on time 95% of the time, versus 79% between 3–6 PM.

Tuesday has been the better bet.

A small edge: 90% on time on Tuesdays against 83% on Sundays.

Best historical flights

Ranked by on-time arrivals, minimum 100 flights. Past performance, not a promise.

Top flights by on-time rate

More flights on this route

The breakdown

On-time by weekday
  • Mon89%(104 flights)
  • Tue90%(81 flights)
  • Wed84%(81 flights)
  • Thu87%(103 flights)
  • Fri85%(104 flights)
  • Sat87%(100 flights)
  • Sun83%(101 flights)
On-time by departure window
  • 6–9 AM95%(315 flights)
  • 3–6 PM79%(339 flights)
  • 6–9 PM80%(20 flights)
On-time trend by month
89%
May

Jun 71% → May 89% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202571%52
July 202571%62
August 202593%54
September 202592%51
October 202598%55
November 202585%60
December 202581%62
January 202688%50
February 202692%52
March 202689%62
April 202690%59
May 202689%55

Same trip, other airports

Keep nerding

Based on 678 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.