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Route Reliability

San Antonio → Washington

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

94
Nerd Approved
WanderNerd Reliability Score
93%
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 93% of the time across 678 flights. No comparison to make.

What the data says

The 6–9 AM departure wins.

SAT–IAD flights departing between 6–9 AM arrived on time 97% of the time, versus 84% between 9 AM–12 PM.

Tuesday has been the better bet.

A small edge: 95% on time on Tuesdays against 90% on Mondays.

Ticking up lately.

SAT–IAD flights arrived on time 95% of the time over the last three months in the data, compared with 91% in the three months before that.

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
  • Mon90%(102 flights)
  • Tue95%(80 flights)
  • Wed91%(80 flights)
  • Thu95%(101 flights)
  • Fri94%(102 flights)
  • Sat90%(104 flights)
  • Sun93%(98 flights)
On-time by departure window
  • 6–9 AM97%(310 flights)
  • 9 AM–12 PM84%(109 flights)
  • 12–3 PM92%(248 flights)
On-time trend by month
96%
May

Jun 88% → May 96% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202588%51
July 202583%60
August 202596%54
September 202594%51
October 202594%54
November 202595%60
December 202592%62
January 202688%51
February 202694%51
March 202692%61
April 202698%58
May 202696%54

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.