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Route Reliability

Washington → San Diego

IAD–SAN · 2,253 miles · Washington Dulles International Airport to San Diego International Airport

88
Pretty Reliable
WanderNerd Reliability Score
84%
Arrive within 15 minutes
3 min early
Average arrival delay
0.4%
Cancelled
1,400
Flights in the data

Data through May 2026.

Who flies it best

Ranked by on-time arrivals. Historical results, not predictions.

  1. 1.United Airlines87%1,040 flights
  2. 2.Alaska Airlines75%360 flights

What the data says

Morning-you made the right choice.

IAD–SAN flights departing between 9 AM–12 PM arrived on time 96% of the time, versus 74% between 6–9 PM.

Friday is doing you no favors.

IAD–SAN flights arrived on time 88% of the time on Tuesdays. On Fridays: 79%.

United Airlines runs this route best.

United Airlines arrived on time 87% of the time on this route; Alaska Airlines managed 75%.

Ticking up lately.

IAD–SAN flights arrived on time 87% of the time over the last three months in the data, compared with 83% 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
  • Mon85%(206 flights)
  • Tue88%(191 flights)
  • Wed82%(191 flights)
  • Thu85%(203 flights)
  • Fri79%(207 flights)
  • Sat87%(180 flights)
  • Sun83%(207 flights)
On-time by departure window
  • 6–9 AM92%(146 flights)
  • 9 AM–12 PM96%(183 flights)
  • 12–3 PM87%(362 flights)
  • 3–6 PM79%(466 flights)
  • 6–9 PM74%(228 flights)
On-time trend by month
84%
May

Jun 74% → May 84% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202574%120
July 202571%122
August 202592%123
September 202591%116
October 202591%116
November 202581%115
December 202579%120
January 202684%107
February 202686%100
March 202686%116
April 202690%110
May 202684%120

Same trip, other airports

Keep nerding

Based on 1,400 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.